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-rw-r--r--html/baremetal/102keyboard.subx.html102
-rw-r--r--html/baremetal/103grapheme.subx.html130
-rw-r--r--html/baremetal/107trace.subx.html149
-rw-r--r--html/baremetal/108write.subx.html115
-rw-r--r--html/baremetal/112read-byte.subx.html95
-rw-r--r--html/baremetal/115write-byte.subx.html99
-rw-r--r--html/baremetal/120allocate.subx.html114
-rw-r--r--html/baremetal/302stack_allocate.subx.html122
-rw-r--r--html/baremetal/309stream.subx.html260
-rw-r--r--html/baremetal/313index-bounds-check.subx.html71
-rw-r--r--html/baremetal/400.mu.html8
-rw-r--r--html/baremetal/403unicode.mu.html255
-rw-r--r--html/baremetal/501draw-text-rightward.mu.html75
-rw-r--r--html/baremetal/boot.hex.html381
-rw-r--r--html/baremetal/ex1.hex.html4
-rw-r--r--html/baremetal/ex1.subx.html12
-rw-r--r--html/baremetal/ex2.hex.html2
-rw-r--r--html/baremetal/ex2.mu.html2
-rw-r--r--html/baremetal/ex2.subx.html42
-rw-r--r--html/baremetal/ex3.hex.html8
-rw-r--r--html/baremetal/ex3.mu.html93
-rw-r--r--html/baremetal/ex4.mu.html77
-rw-r--r--html/baremetal/ex5.mu.html75
23 files changed, 1991 insertions, 300 deletions
diff --git a/html/baremetal/102keyboard.subx.html b/html/baremetal/102keyboard.subx.html
new file mode 100644
index 00000000..f841e696
--- /dev/null
+++ b/html/baremetal/102keyboard.subx.html
@@ -0,0 +1,102 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/102keyboard.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
+.LineNr { }
+.subxS1Comment { color: #0000af; }
+.subxFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/102keyboard.subx'>https://github.com/akkartik/mu/blob/main/baremetal/102keyboard.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># check keyboard for a key</span>
+<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># return 0 on no keypress or unrecognized key</span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxFunction">read-key</span>:  <span class="subxComment"># kbd: (addr keyboard) -&gt; result/eax: byte</span>
+<span id="L4" class="LineNr"> 4 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L5" class="LineNr"> 5 </span>    55/push-ebp
+<span id="L6" class="LineNr"> 6 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L7" class="LineNr"> 7 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L8" class="LineNr"> 8 </span>    51/push-ecx
+<span id="L9" class="LineNr"> 9 </span>    <span class="subxComment"># result = 0</span>
+<span id="L10" class="LineNr">10 </span>    b8/copy-to-eax 0/imm32
+<span id="L11" class="LineNr">11 </span>    <span class="subxComment"># ecx = keyboard</span>
+<span id="L12" class="LineNr">12 </span>    8b/-&gt; *(ebp+8) 1/r32/ecx
+<span id="L13" class="LineNr">13 </span>    81 7/subop/compare %ecx 0/imm32
+<span id="L14" class="LineNr">14 </span>    {
+<span id="L15" class="LineNr">15 </span>      75/jump-if-!= <span class="Constant">break</span>/disp8
+<span id="L16" class="LineNr">16 </span>      <span class="subxComment"># var read/ecx: byte = keyboard buffer's read index</span>
+<span id="L17" class="LineNr">17 </span>      8b/-&gt; *0x7dcc 1/r32/CL  <span class="subxComment"># keyboard-buffer-read</span>
+<span id="L18" class="LineNr">18 </span>      <span class="subxComment"># var next-key/eax: byte = *(keyboard buffer + ecx)</span>
+<span id="L19" class="LineNr">19 </span>      8a/byte-&gt; *(ecx+0x7dd0) 0/r32/AL  <span class="subxComment"># keyboard-buffer-data</span>
+<span id="L20" class="LineNr">20 </span>      <span class="subxComment"># if (next-key != 0) lock and remove from keyboard-buffer</span>
+<span id="L21" class="LineNr">21 </span>      81 7/subop/compare %eax 0/imm32
+<span id="L22" class="LineNr">22 </span>      {
+<span id="L23" class="LineNr">23 </span>        74/jump-if-= <span class="Constant">break</span>/disp8
+<span id="L24" class="LineNr">24 </span>        <span class="subxComment"># TODO: add some instructions in this block to SubX if we ever want to</span>
+<span id="L25" class="LineNr">25 </span>        <span class="subxComment"># use bootstrap on baremetal programs</span>
+<span id="L26" class="LineNr">26 </span>        fa/disable-interrupts
+<span id="L27" class="LineNr">27 </span>        c6 0/subop/copy-byte *(ecx+0x7dd0) 0/imm8
+<span id="L28" class="LineNr">28 </span>        ff 0/subop/increment *0x7dcc  <span class="subxComment"># keyboard-buffer-read</span>
+<span id="L29" class="LineNr">29 </span>        81 4/subop/and *0x7dcc 0xf/imm32  <span class="subxComment"># keyboard-buffer-read</span>
+<span id="L30" class="LineNr">30 </span>        fb/enable-interrupts
+<span id="L31" class="LineNr">31 </span>      }
+<span id="L32" class="LineNr">32 </span>      <span class="subxComment"># return</span>
+<span id="L33" class="LineNr">33 </span>      eb $read-key:end/disp8
+<span id="L34" class="LineNr">34 </span>    }
+<span id="L35" class="LineNr">35 </span>    <span class="subxComment"># TODO: fake keyboard</span>
+<span id="L36" class="LineNr">36 </span><span class="Constant">$read-key:end</span>:
+<span id="L37" class="LineNr">37 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L38" class="LineNr">38 </span>    59/pop-to-ecx
+<span id="L39" class="LineNr">39 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L40" class="LineNr">40 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L41" class="LineNr">41 </span>    5d/pop-to-ebp
+<span id="L42" class="LineNr">42 </span>    c3/return
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/103grapheme.subx.html b/html/baremetal/103grapheme.subx.html
new file mode 100644
index 00000000..b34168d6
--- /dev/null
+++ b/html/baremetal/103grapheme.subx.html
@@ -0,0 +1,130 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/103grapheme.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
+.LineNr { }
+.subxS1Comment { color: #0000af; }
+.subxFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx'>https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxFunction">draw-grapheme</span>:  <span class="subxComment"># screen: (addr screen), g: grapheme, x: int, y: int, color: int</span>
+<span id="L2" class="LineNr"> 2 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L3" class="LineNr"> 3 </span>    55/push-ebp
+<span id="L4" class="LineNr"> 4 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L5" class="LineNr"> 5 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L6" class="LineNr"> 6 </span>    50/push-eax
+<span id="L7" class="LineNr"> 7 </span>    51/push-ecx
+<span id="L8" class="LineNr"> 8 </span>    52/push-edx
+<span id="L9" class="LineNr"> 9 </span>    53/push-ebx
+<span id="L10" class="LineNr">10 </span>    56/push-esi
+<span id="L11" class="LineNr">11 </span>    <span class="subxComment"># var letter-bitmap/esi = font[g]</span>
+<span id="L12" class="LineNr">12 </span>    8b/-&gt; *(ebp+0xc) 6/r32/esi
+<span id="L13" class="LineNr">13 </span>    c1 4/subop/shift-left %esi 4/imm8
+<span id="L14" class="LineNr">14 </span>    8d/copy-address *(esi+0x8800) 6/r32/esi  <span class="subxComment"># font-start</span>
+<span id="L15" class="LineNr">15 </span>    <span class="subxComment"># if (letter-bitmap &gt;= 0x9000) return  # characters beyond ASCII currently not supported</span>
+<span id="L16" class="LineNr">16 </span>    81 7/subop/compare %esi 0x9000/imm32
+<span id="L17" class="LineNr">17 </span>    7d/jump-if-&gt;= $draw-grapheme:end/disp8
+<span id="L18" class="LineNr">18 </span>    <span class="subxComment"># edx = y</span>
+<span id="L19" class="LineNr">19 </span>    8b/-&gt; *(ebp+0x14) 2/r32/edx
+<span id="L20" class="LineNr">20 </span>    <span class="subxComment"># var ymax/ebx: int = y + 16</span>
+<span id="L21" class="LineNr">21 </span>    8b/-&gt; *(ebp+0x14) 3/r32/ebx
+<span id="L22" class="LineNr">22 </span>    81 0/subop/add %ebx 0x10/imm32
+<span id="L23" class="LineNr">23 </span>    {
+<span id="L24" class="LineNr">24 </span>      <span class="subxComment"># if (y &gt;= ymax) break</span>
+<span id="L25" class="LineNr">25 </span>      39/compare %edx 3/r32/ebx
+<span id="L26" class="LineNr">26 </span>      7d/jump-if-&gt;= <span class="Constant">break</span>/disp8
+<span id="L27" class="LineNr">27 </span>      <span class="subxComment"># eax = x + 7</span>
+<span id="L28" class="LineNr">28 </span>      8b/-&gt; *(ebp+0x10) 0/r32/eax
+<span id="L29" class="LineNr">29 </span>      81 0/subop/add %eax 7/imm32
+<span id="L30" class="LineNr">30 </span>      <span class="subxComment"># var xmin/ecx: int = x</span>
+<span id="L31" class="LineNr">31 </span>      8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L32" class="LineNr">32 </span>      <span class="subxComment"># var row-bitmap/ebx: int = *letter-bitmap</span>
+<span id="L33" class="LineNr">33 </span>      53/push-ebx
+<span id="L34" class="LineNr">34 </span>      8b/-&gt; *esi 3/r32/ebx
+<span id="L35" class="LineNr">35 </span>      {
+<span id="L36" class="LineNr">36 </span>        <span class="subxComment"># if (x &lt; xmin) break</span>
+<span id="L37" class="LineNr">37 </span>        39/compare %eax 1/r32/ecx
+<span id="L38" class="LineNr">38 </span>        7c/jump-if-&lt; <span class="Constant">break</span>/disp8
+<span id="L39" class="LineNr">39 </span>        <span class="subxComment"># shift LSB from row-bitmap into carry flag (CF)</span>
+<span id="L40" class="LineNr">40 </span>        c1 5/subop/shift-right-logical %ebx 1/imm8
+<span id="L41" class="LineNr">41 </span>        <span class="subxComment"># if LSB, draw a pixel</span>
+<span id="L42" class="LineNr">42 </span>        {
+<span id="L43" class="LineNr">43 </span>          73/jump-if-not-CF <span class="Constant">break</span>/disp8
+<span id="L44" class="LineNr">44 </span>          (<a href='101screen.subx.html#L3'>pixel</a> *(ebp+8) %eax %edx *(ebp+0x18))
+<span id="L45" class="LineNr">45 </span>        }
+<span id="L46" class="LineNr">46 </span>        <span class="subxComment"># --x</span>
+<span id="L47" class="LineNr">47 </span>        48/decrement-eax
+<span id="L48" class="LineNr">48 </span>        <span class="subxComment">#</span>
+<span id="L49" class="LineNr">49 </span>        eb/jump <span class="Constant">loop</span>/disp8
+<span id="L50" class="LineNr">50 </span>      }
+<span id="L51" class="LineNr">51 </span>      <span class="subxComment"># reclaim row-bitmap</span>
+<span id="L52" class="LineNr">52 </span>      5b/pop-to-ebx
+<span id="L53" class="LineNr">53 </span>      <span class="subxComment"># ++y</span>
+<span id="L54" class="LineNr">54 </span>      42/increment-edx
+<span id="L55" class="LineNr">55 </span>      <span class="subxComment"># next bitmap row</span>
+<span id="L56" class="LineNr">56 </span>      46/increment-esi
+<span id="L57" class="LineNr">57 </span>      <span class="subxComment">#</span>
+<span id="L58" class="LineNr">58 </span>      eb/jump <span class="Constant">loop</span>/disp8
+<span id="L59" class="LineNr">59 </span>    }
+<span id="L60" class="LineNr">60 </span><span class="Constant">$draw-grapheme:end</span>:
+<span id="L61" class="LineNr">61 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L62" class="LineNr">62 </span>    5e/pop-to-esi
+<span id="L63" class="LineNr">63 </span>    5b/pop-to-ebx
+<span id="L64" class="LineNr">64 </span>    5a/pop-to-edx
+<span id="L65" class="LineNr">65 </span>    59/pop-to-ecx
+<span id="L66" class="LineNr">66 </span>    58/pop-to-eax
+<span id="L67" class="LineNr">67 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L68" class="LineNr">68 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L69" class="LineNr">69 </span>    5d/pop-to-ebp
+<span id="L70" class="LineNr">70 </span>    c3/return
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/107trace.subx.html b/html/baremetal/107trace.subx.html
new file mode 100644
index 00000000..db7cdd65
--- /dev/null
+++ b/html/baremetal/107trace.subx.html
@@ -0,0 +1,149 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/107trace.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
+.subxS1Comment { color: #0000af; }
+.subxS2Comment { color: #8a8a8a; }
+.LineNr { }
+.Constant { color: #008787; }
+.subxMinorFunction { color: #875f5f; }
+.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/107trace.subx'>https://github.com/akkartik/mu/blob/main/baremetal/107trace.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
+<span id="L2" class="LineNr"> 2 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxS1Comment"># . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
+<span id="L4" class="LineNr"> 4 </span>
+<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># 3-argument variant of _append</span>
+<span id="L6" class="LineNr"> 6 </span><span class="subxMinorFunction">_append-3</span>:  <span class="subxComment"># out: (addr byte), outend: (addr byte), s: (addr array byte) -&gt; num_bytes_appended/eax</span>
+<span id="L7" class="LineNr"> 7 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L8" class="LineNr"> 8 </span>    55/push-ebp
+<span id="L9" class="LineNr"> 9 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
+<span id="L10" class="LineNr">10 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L11" class="LineNr">11 </span>    51/push-ecx
+<span id="L12" class="LineNr">12 </span>    <span class="subxComment"># eax = _append-4(out, outend, &amp;s-&gt;data[0], &amp;s-&gt;data[s-&gt;size])</span>
+<span id="L13" class="LineNr">13 </span>    <span class="subxS2Comment"># . . push &amp;s-&gt;data[s-&gt;size]</span>
+<span id="L14" class="LineNr">14 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>                        0/r32/eax   0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+16) to eax</span>
+<span id="L15" class="LineNr">15 </span>    8b/copy                         0/mod/indirect  0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *eax to ecx</span>
+<span id="L16" class="LineNr">16 </span>    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx  <span class="Normal"> . </span>          1/r32/ecx   4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy eax+ecx+4 to ecx</span>
+<span id="L17" class="LineNr">17 </span>    51/push-ecx
+<span id="L18" class="LineNr">18 </span>    <span class="subxS2Comment"># . . push &amp;s-&gt;data[0]</span>
+<span id="L19" class="LineNr">19 </span>    8d/copy-address                 1/mod/*+disp8   0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy eax+4 to ecx</span>
+<span id="L20" class="LineNr">20 </span>    51/push-ecx
+<span id="L21" class="LineNr">21 </span>    <span class="subxS2Comment"># . . push outend</span>
+<span id="L22" class="LineNr">22 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
+<span id="L23" class="LineNr">23 </span>    <span class="subxS2Comment"># . . push out</span>
+<span id="L24" class="LineNr">24 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+8)</span>
+<span id="L25" class="LineNr">25 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L26" class="LineNr">26 </span>    e8/call  <a href='107trace.subx.html#L38'>_append-4</a>/disp32
+<span id="L27" class="LineNr">27 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L28" class="LineNr">28 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0x10/imm32        <span class="subxComment"># add to esp</span>
+<span id="L29" class="LineNr">29 </span><span class="Constant">$_append-3:end</span>:
+<span id="L30" class="LineNr">30 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L31" class="LineNr">31 </span>    59/pop-to-ecx
+<span id="L32" class="LineNr">32 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L33" class="LineNr">33 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
+<span id="L34" class="LineNr">34 </span>    5d/pop-to-ebp
+<span id="L35" class="LineNr">35 </span>    c3/return
+<span id="L36" class="LineNr">36 </span>
+<span id="L37" class="LineNr">37 </span><span class="subxComment"># 4-argument variant of _append</span>
+<span id="L38" class="LineNr">38 </span><span class="subxMinorFunction">_append-4</span>:  <span class="subxComment"># out: (addr byte), outend: (addr byte), in: (addr byte), inend: (addr byte) -&gt; num_bytes_appended/eax: int</span>
+<span id="L39" class="LineNr">39 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L40" class="LineNr">40 </span>    55/push-ebp
+<span id="L41" class="LineNr">41 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
+<span id="L42" class="LineNr">42 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L43" class="LineNr">43 </span>    51/push-ecx
+<span id="L44" class="LineNr">44 </span>    52/push-edx
+<span id="L45" class="LineNr">45 </span>    53/push-ebx
+<span id="L46" class="LineNr">46 </span>    56/push-esi
+<span id="L47" class="LineNr">47 </span>    57/push-edi
+<span id="L48" class="LineNr">48 </span>    <span class="subxComment"># num_bytes_appended = 0</span>
+<span id="L49" class="LineNr">49 </span>    b8/copy-to-eax  0/imm32
+<span id="L50" class="LineNr">50 </span>    <span class="subxComment"># edi = out</span>
+<span id="L51" class="LineNr">51 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to edi</span>
+<span id="L52" class="LineNr">52 </span>    <span class="subxComment"># edx = outend</span>
+<span id="L53" class="LineNr">53 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to edx</span>
+<span id="L54" class="LineNr">54 </span>    <span class="subxComment"># esi = in</span>
+<span id="L55" class="LineNr">55 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+16) to esi</span>
+<span id="L56" class="LineNr">56 </span>    <span class="subxComment"># ecx = inend</span>
+<span id="L57" class="LineNr">57 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   0x14/disp8     <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+20) to ecx</span>
+<span id="L58" class="LineNr">58 </span><span class="Constant">$_append-4:loop</span>:
+<span id="L59" class="LineNr">59 </span>    <span class="subxComment"># if (in &gt;= inend) break</span>
+<span id="L60" class="LineNr">60 </span>    39/compare                      3/mod/direct    6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare esi with ecx</span>
+<span id="L61" class="LineNr">61 </span>    73/jump-if-addr&gt;=  $_append-4:end/disp8
+<span id="L62" class="LineNr">62 </span>    <span class="subxComment"># if (out &gt;= outend) abort  # just to catch test failures fast</span>
+<span id="L63" class="LineNr">63 </span>    39/compare                      3/mod/direct    7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare edi with edx</span>
+<span id="L64" class="LineNr">64 </span>    73/jump-if-addr&gt;=  $_append-4:end/disp8  <span class="subxComment"># TODO: abort</span>
+<span id="L65" class="LineNr">65 </span>    <span class="subxComment"># *out = *in</span>
+<span id="L66" class="LineNr">66 </span>    8a/copy-byte                    0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/BL   <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *esi to BL</span>
+<span id="L67" class="LineNr">67 </span>    88/copy-byte                    0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/BL   <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy byte at BL to *edi</span>
+<span id="L68" class="LineNr">68 </span>    <span class="subxComment"># ++num_bytes_appended</span>
+<span id="L69" class="LineNr">69 </span>    40/increment-eax
+<span id="L70" class="LineNr">70 </span>    <span class="subxComment"># ++in</span>
+<span id="L71" class="LineNr">71 </span>    46/increment-esi
+<span id="L72" class="LineNr">72 </span>    <span class="subxComment"># ++out</span>
+<span id="L73" class="LineNr">73 </span>    47/increment-edi
+<span id="L74" class="LineNr">74 </span>    eb/jump  $_append-4:<span class="Constant">loop</span>/disp8
+<span id="L75" class="LineNr">75 </span><span class="Constant">$_append-4:end</span>:
+<span id="L76" class="LineNr">76 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L77" class="LineNr">77 </span>    5f/pop-to-edi
+<span id="L78" class="LineNr">78 </span>    5e/pop-to-esi
+<span id="L79" class="LineNr">79 </span>    5b/pop-to-ebx
+<span id="L80" class="LineNr">80 </span>    5a/pop-to-edx
+<span id="L81" class="LineNr">81 </span>    59/pop-to-ecx
+<span id="L82" class="LineNr">82 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L83" class="LineNr">83 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
+<span id="L84" class="LineNr">84 </span>    5d/pop-to-ebp
+<span id="L85" class="LineNr">85 </span>    c3/return
+<span id="L86" class="LineNr">86 </span>
+<span id="L87" class="LineNr">87 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/108write.subx.html b/html/baremetal/108write.subx.html
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+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/108write.subx</title>
+<meta name="Generator" content="Vim/8.1">
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+<a href='https://github.com/akkartik/mu/blob/main/baremetal/108write.subx'>https://github.com/akkartik/mu/blob/main/baremetal/108write.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
+<span id="L2" class="LineNr"> 2 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxS1Comment"># . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
+<span id="L4" class="LineNr"> 4 </span>
+<span id="L5" class="LineNr"> 5 </span><span class="subxFunction">write</span>:  <span class="subxComment"># f: (addr stream byte), s: (addr array byte)</span>
+<span id="L6" class="LineNr"> 6 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L7" class="LineNr"> 7 </span>    55/push-ebp
+<span id="L8" class="LineNr"> 8 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
+<span id="L9" class="LineNr"> 9 </span>    <span class="subxComment"># if (s == 0) return</span>
+<span id="L10" class="LineNr">10 </span>    81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8       0/imm32           <span class="subxComment"># compare *(ebp+12)</span>
+<span id="L11" class="LineNr">11 </span>    74/jump-if-=  $write:end/disp8
+<span id="L12" class="LineNr">12 </span>    <span class="subxComment"># TODO: write to file</span>
+<span id="L13" class="LineNr">13 </span>    <span class="subxComment"># otherwise, treat 'f' as a stream to append to</span>
+<span id="L14" class="LineNr">14 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L15" class="LineNr">15 </span>    50/push-eax
+<span id="L16" class="LineNr">16 </span>    51/push-ecx
+<span id="L17" class="LineNr">17 </span>    52/push-edx
+<span id="L18" class="LineNr">18 </span>    53/push-ebx
+<span id="L19" class="LineNr">19 </span>    <span class="subxComment"># ecx = f</span>
+<span id="L20" class="LineNr">20 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>                        1/r32/ecx   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to ecx</span>
+<span id="L21" class="LineNr">21 </span>    <span class="subxComment"># edx = f-&gt;write</span>
+<span id="L22" class="LineNr">22 </span>    8b/copy                         0/mod/indirect  1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *ecx to edx</span>
+<span id="L23" class="LineNr">23 </span>    <span class="subxComment"># ebx = f-&gt;size</span>
+<span id="L24" class="LineNr">24 </span>    8b/copy                         1/mod/*+disp8   1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/ebx   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ecx+8) to ebx</span>
+<span id="L25" class="LineNr">25 </span>    <span class="subxComment"># eax = _append-3(&amp;f-&gt;data[f-&gt;write], &amp;f-&gt;data[f-&gt;size], s)</span>
+<span id="L26" class="LineNr">26 </span>    <span class="subxS2Comment"># . . push s</span>
+<span id="L27" class="LineNr">27 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
+<span id="L28" class="LineNr">28 </span>    <span class="subxS2Comment"># . . push &amp;f-&gt;data[f-&gt;size]</span>
+<span id="L29" class="LineNr">29 </span>    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    1/base/ecx  3/index/ebx  <span class="Normal"> . </span>          3/r32/ebx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy ecx+ebx+12 to ebx</span>
+<span id="L30" class="LineNr">30 </span>    53/push-ebx
+<span id="L31" class="LineNr">31 </span>    <span class="subxS2Comment"># . . push &amp;f-&gt;data[f-&gt;write]</span>
+<span id="L32" class="LineNr">32 </span>    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    1/base/ecx  2/index/edx  <span class="Normal"> . </span>          3/r32/ebx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy ecx+edx+12 to ebx</span>
+<span id="L33" class="LineNr">33 </span>    53/push-ebx
+<span id="L34" class="LineNr">34 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L35" class="LineNr">35 </span>    e8/call  <a href='107trace.subx.html#L6'>_append-3</a>/disp32
+<span id="L36" class="LineNr">36 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L37" class="LineNr">37 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
+<span id="L38" class="LineNr">38 </span>    <span class="subxComment"># f-&gt;write += eax</span>
+<span id="L39" class="LineNr">39 </span>    01/add                          0/mod/indirect  1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># add eax to *ecx</span>
+<span id="L40" class="LineNr">40 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L41" class="LineNr">41 </span>    5b/pop-to-ebx
+<span id="L42" class="LineNr">42 </span>    5a/pop-to-edx
+<span id="L43" class="LineNr">43 </span>    59/pop-to-ecx
+<span id="L44" class="LineNr">44 </span>    58/pop-to-eax
+<span id="L45" class="LineNr">45 </span><span class="Constant">$write:end</span>:
+<span id="L46" class="LineNr">46 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L47" class="LineNr">47 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
+<span id="L48" class="LineNr">48 </span>    5d/pop-to-ebp
+<span id="L49" class="LineNr">49 </span>    c3/return
+<span id="L50" class="LineNr">50 </span>
+<span id="L51" class="LineNr">51 </span><span class="subxComment"># TODO: bring in tests once we have check-ints-equal</span>
+<span id="L52" class="LineNr">52 </span>
+<span id="L53" class="LineNr">53 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/112read-byte.subx.html b/html/baremetal/112read-byte.subx.html
new file mode 100644
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+++ b/html/baremetal/112read-byte.subx.html
@@ -0,0 +1,95 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/112read-byte.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { font-family: monospace; color: #000000; background-color: #c6c6c6; }
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+.Constant { color: #008787; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/112read-byte.subx'>https://github.com/akkartik/mu/blob/main/baremetal/112read-byte.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># TODO: read-byte-buffered</span>
+<span id="L2" class="LineNr"> 2 </span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># Return next byte value in eax, with top 3 bytes cleared.</span>
+<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># Abort on reaching end of stream.</span>
+<span id="L5" class="LineNr"> 5 </span><span class="subxFunction">read-byte</span>:  <span class="subxComment"># s: (addr stream byte) -&gt; result/eax: byte</span>
+<span id="L6" class="LineNr"> 6 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L7" class="LineNr"> 7 </span>    55/push-ebp
+<span id="L8" class="LineNr"> 8 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
+<span id="L9" class="LineNr"> 9 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L10" class="LineNr">10 </span>    51/push-ecx
+<span id="L11" class="LineNr">11 </span>    56/push-esi
+<span id="L12" class="LineNr">12 </span>    <span class="subxComment"># esi = s</span>
+<span id="L13" class="LineNr">13 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
+<span id="L14" class="LineNr">14 </span>    <span class="subxComment"># ecx = s-&gt;read</span>
+<span id="L15" class="LineNr">15 </span>    8b/copy                         1/mod/*+disp8   6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(esi+4) to ecx</span>
+<span id="L16" class="LineNr">16 </span>    <span class="subxComment"># if (f-&gt;read &gt;= f-&gt;write) abort</span>
+<span id="L17" class="LineNr">17 </span>    3b/compare                      0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare ecx with *esi</span>
+<span id="L18" class="LineNr">18 </span>    0f 8d/jump-if-&gt;=  $read-byte:end/disp32  <span class="subxComment"># TODO: abort</span>
+<span id="L19" class="LineNr">19 </span>    <span class="subxComment"># result = f-&gt;data[f-&gt;read]</span>
+<span id="L20" class="LineNr">20 </span>    31/xor                          3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># clear eax</span>
+<span id="L21" class="LineNr">21 </span>    8a/copy-byte                    1/mod/*+disp8   4/rm32/sib    6/base/esi  1/index/ecx  <span class="Normal"> . </span>          0/r32/AL    0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *(esi+ecx+12) to AL</span>
+<span id="L22" class="LineNr">22 </span>    <span class="subxComment"># ++f-&gt;read</span>
+<span id="L23" class="LineNr">23 </span>    ff          0/subop/increment   1/mod/*+disp8   6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># increment *(esi+4)</span>
+<span id="L24" class="LineNr">24 </span><span class="Constant">$read-byte:end</span>:
+<span id="L25" class="LineNr">25 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L26" class="LineNr">26 </span>    5e/pop-to-esi
+<span id="L27" class="LineNr">27 </span>    59/pop-to-ecx
+<span id="L28" class="LineNr">28 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L29" class="LineNr">29 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
+<span id="L30" class="LineNr">30 </span>    5d/pop-to-ebp
+<span id="L31" class="LineNr">31 </span>    c3/return
+<span id="L32" class="LineNr">32 </span>
+<span id="L33" class="LineNr">33 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/115write-byte.subx.html b/html/baremetal/115write-byte.subx.html
new file mode 100644
index 00000000..43cbc843
--- /dev/null
+++ b/html/baremetal/115write-byte.subx.html
@@ -0,0 +1,99 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/115write-byte.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
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+.Constant { color: #008787; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/115write-byte.subx'>https://github.com/akkartik/mu/blob/main/baremetal/115write-byte.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
+<span id="L2" class="LineNr"> 2 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxS1Comment"># . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
+<span id="L4" class="LineNr"> 4 </span>
+<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># Write lower byte of 'n' to 'f'.</span>
+<span id="L6" class="LineNr"> 6 </span><span class="subxFunction">append-byte</span>:  <span class="subxComment"># f: (addr stream byte), n: int</span>
+<span id="L7" class="LineNr"> 7 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L8" class="LineNr"> 8 </span>    55/push-ebp
+<span id="L9" class="LineNr"> 9 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
+<span id="L10" class="LineNr">10 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L11" class="LineNr">11 </span>    51/push-ecx
+<span id="L12" class="LineNr">12 </span>    57/push-edi
+<span id="L13" class="LineNr">13 </span>    <span class="subxComment"># edi = f</span>
+<span id="L14" class="LineNr">14 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to edi</span>
+<span id="L15" class="LineNr">15 </span>    <span class="subxComment"># ecx = f-&gt;write</span>
+<span id="L16" class="LineNr">16 </span>    8b/copy                         0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *edi to ecx</span>
+<span id="L17" class="LineNr">17 </span>    <span class="subxComment"># if (f-&gt;write &gt;= f-&gt;size) abort</span>
+<span id="L18" class="LineNr">18 </span>    3b/compare                      1/mod/*+disp8   7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># compare ecx with *(edi+8)</span>
+<span id="L19" class="LineNr">19 </span>    7d/jump-if-&gt;=  $append-byte:end/disp8  <span class="subxComment"># TODO: abort</span>
+<span id="L20" class="LineNr">20 </span><span class="Constant">$append-byte:to-stream</span>:
+<span id="L21" class="LineNr">21 </span>    <span class="subxComment"># write to stream</span>
+<span id="L22" class="LineNr">22 </span>    <span class="subxComment"># f-&gt;data[f-&gt;write] = LSB(n)</span>
+<span id="L23" class="LineNr">23 </span>    31/xor                          3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># clear eax</span>
+<span id="L24" class="LineNr">24 </span>    8a/copy-byte                    1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/AL    0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *(ebp+12) to AL</span>
+<span id="L25" class="LineNr">25 </span>    88/copy-byte                    1/mod/*+disp8   4/rm32/sib    7/base/edi  1/index/ecx  <span class="Normal"> . </span>          0/r32/AL    0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy AL to *(edi+ecx+12)</span>
+<span id="L26" class="LineNr">26 </span>    <span class="subxComment"># ++f-&gt;write</span>
+<span id="L27" class="LineNr">27 </span>    ff          0/subop/increment   0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># increment *edi</span>
+<span id="L28" class="LineNr">28 </span><span class="Constant">$append-byte:end</span>:
+<span id="L29" class="LineNr">29 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L30" class="LineNr">30 </span>    5f/pop-to-edi
+<span id="L31" class="LineNr">31 </span>    59/pop-to-ecx
+<span id="L32" class="LineNr">32 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L33" class="LineNr">33 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
+<span id="L34" class="LineNr">34 </span>    5d/pop-to-ebp
+<span id="L35" class="LineNr">35 </span>    c3/return
+<span id="L36" class="LineNr">36 </span>
+<span id="L37" class="LineNr">37 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/120allocate.subx.html b/html/baremetal/120allocate.subx.html
new file mode 100644
index 00000000..e11f9b00
--- /dev/null
+++ b/html/baremetal/120allocate.subx.html
@@ -0,0 +1,114 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/120allocate.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
+.subxS1Comment { color: #0000af; }
+.subxS2Comment { color: #8a8a8a; }
+.LineNr { }
+.subxFunction { color: #af5f00; text-decoration: underline; }
+.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
+.Constant { color: #008787; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/120allocate.subx'>https://github.com/akkartik/mu/blob/main/baremetal/120allocate.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
+<span id="L2" class="LineNr"> 2 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxS1Comment"># . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
+<span id="L4" class="LineNr"> 4 </span>
+<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># Fill a region of memory with zeroes.</span>
+<span id="L6" class="LineNr"> 6 </span><span class="subxFunction">zero-out</span>:  <span class="subxComment"># start: (addr byte), size: int</span>
+<span id="L7" class="LineNr"> 7 </span>    <span class="subxComment"># pseudocode:</span>
+<span id="L8" class="LineNr"> 8 </span>    <span class="subxComment">#   curr/esi = start</span>
+<span id="L9" class="LineNr"> 9 </span>    <span class="subxComment">#   i/ecx = 0</span>
+<span id="L10" class="LineNr">10 </span>    <span class="subxComment">#   while true</span>
+<span id="L11" class="LineNr">11 </span>    <span class="subxComment">#     if (i &gt;= size) break</span>
+<span id="L12" class="LineNr">12 </span>    <span class="subxComment">#     *curr = 0</span>
+<span id="L13" class="LineNr">13 </span>    <span class="subxComment">#     ++curr</span>
+<span id="L14" class="LineNr">14 </span>    <span class="subxComment">#     ++i</span>
+<span id="L15" class="LineNr">15 </span>    <span class="subxComment">#</span>
+<span id="L16" class="LineNr">16 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L17" class="LineNr">17 </span>    55/push-ebp
+<span id="L18" class="LineNr">18 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
+<span id="L19" class="LineNr">19 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L20" class="LineNr">20 </span>    50/push-eax
+<span id="L21" class="LineNr">21 </span>    51/push-ecx
+<span id="L22" class="LineNr">22 </span>    52/push-edx
+<span id="L23" class="LineNr">23 </span>    56/push-esi
+<span id="L24" class="LineNr">24 </span>    <span class="subxComment"># curr/esi = start</span>
+<span id="L25" class="LineNr">25 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
+<span id="L26" class="LineNr">26 </span>    <span class="subxComment"># var i/ecx: int = 0</span>
+<span id="L27" class="LineNr">27 </span>    31/xor                          3/mod/direct    1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># clear ecx</span>
+<span id="L28" class="LineNr">28 </span>    <span class="subxComment"># edx = size</span>
+<span id="L29" class="LineNr">29 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to edx</span>
+<span id="L30" class="LineNr">30 </span><span class="Constant">$zero-out:loop</span>:
+<span id="L31" class="LineNr">31 </span>    <span class="subxComment"># if (i &gt;= size) break</span>
+<span id="L32" class="LineNr">32 </span>    39/compare                      3/mod/direct    1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare ecx with edx</span>
+<span id="L33" class="LineNr">33 </span>    7d/jump-if-&gt;=  $zero-out:end/disp8
+<span id="L34" class="LineNr">34 </span>    <span class="subxComment"># *curr = 0</span>
+<span id="L35" class="LineNr">35 </span>    c6          0/subop/copy-byte   0/mod/direct    6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0/imm8            <span class="subxComment"># copy byte to *esi</span>
+<span id="L36" class="LineNr">36 </span>    <span class="subxComment"># ++curr</span>
+<span id="L37" class="LineNr">37 </span>    46/increment-esi
+<span id="L38" class="LineNr">38 </span>    <span class="subxComment"># ++i</span>
+<span id="L39" class="LineNr">39 </span>    41/increment-ecx
+<span id="L40" class="LineNr">40 </span>    eb/jump  $zero-out:<span class="Constant">loop</span>/disp8
+<span id="L41" class="LineNr">41 </span><span class="Constant">$zero-out:end</span>:
+<span id="L42" class="LineNr">42 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L43" class="LineNr">43 </span>    5e/pop-to-esi
+<span id="L44" class="LineNr">44 </span>    5a/pop-to-edx
+<span id="L45" class="LineNr">45 </span>    59/pop-to-ecx
+<span id="L46" class="LineNr">46 </span>    58/pop-to-eax
+<span id="L47" class="LineNr">47 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L48" class="LineNr">48 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
+<span id="L49" class="LineNr">49 </span>    5d/pop-to-ebp
+<span id="L50" class="LineNr">50 </span>    c3/return
+<span id="L51" class="LineNr">51 </span>
+<span id="L52" class="LineNr">52 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/302stack_allocate.subx.html b/html/baremetal/302stack_allocate.subx.html
new file mode 100644
index 00000000..73e18ff6
--- /dev/null
+++ b/html/baremetal/302stack_allocate.subx.html
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
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+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/302stack_allocate.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
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+-->
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+/* function to open any folds containing a jumped-to line before jumping to it */
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+  /* Always jump to new location even if the line was hidden inside a fold, or
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+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/302stack_allocate.subx'>https://github.com/akkartik/mu/blob/main/baremetal/302stack_allocate.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># A function which pushes n zeros on the stack.</span>
+<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># Really only intended to be called from code generated by mu.subx (for array</span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># vars on the stack).</span>
+<span id="L4" class="LineNr"> 4 </span>
+<span id="L5" class="LineNr"> 5 </span>== code
+<span id="L6" class="LineNr"> 6 </span>
+<span id="L7" class="LineNr"> 7 </span><span class="CommentedCode">#? Entry:</span>
+<span id="L8" class="LineNr"> 8 </span><span class="CommentedCode">#?     # . prologue</span>
+<span id="L9" class="LineNr"> 9 </span><span class="CommentedCode">#?     89/&lt;- %ebp 4/r32/esp</span>
+<span id="L10" class="LineNr">10 </span><span class="CommentedCode">#?     #</span>
+<span id="L11" class="LineNr">11 </span><span class="CommentedCode">#?     68/push 0xfcfdfeff/imm32</span>
+<span id="L12" class="LineNr">12 </span><span class="CommentedCode">#?     b8/copy-to-eax 0x34353637/imm32</span>
+<span id="L13" class="LineNr">13 </span><span class="CommentedCode">#? $dump-stack0:</span>
+<span id="L14" class="LineNr">14 </span><span class="CommentedCode">#?     (push-n-zero-bytes 4)</span>
+<span id="L15" class="LineNr">15 </span><span class="CommentedCode">#?     68/push 0x20/imm32</span>
+<span id="L16" class="LineNr">16 </span><span class="CommentedCode">#? $dump-stack9:</span>
+<span id="L17" class="LineNr">17 </span><span class="CommentedCode">#?     b8/copy-to-eax 1/imm32/exit</span>
+<span id="L18" class="LineNr">18 </span><span class="CommentedCode">#?     cd/syscall 0x80/imm8</span>
+<span id="L19" class="LineNr">19 </span>
+<span id="L20" class="LineNr">20 </span><span class="subxComment"># This is not a regular function, so it won't be idiomatic.</span>
+<span id="L21" class="LineNr">21 </span><span class="subxComment"># Registers must be properly restored.</span>
+<span id="L22" class="LineNr">22 </span><span class="subxComment"># Registers can be spilled, but that modifies the stack and needs to be</span>
+<span id="L23" class="LineNr">23 </span><span class="subxComment"># cleaned up.</span>
+<span id="L24" class="LineNr">24 </span>
+<span id="L25" class="LineNr">25 </span><span class="subxComment"># Overhead:</span>
+<span id="L26" class="LineNr">26 </span><span class="subxComment">#   62 + n*6 instructions to push n bytes.</span>
+<span id="L27" class="LineNr">27 </span><span class="subxComment"># If we just emitted code to push n zeroes, it would be:</span>
+<span id="L28" class="LineNr">28 </span><span class="subxComment">#   5 bytes for 4 zero bytes, so 1.25 bytes per zero. And that's not even</span>
+<span id="L29" class="LineNr">29 </span><span class="subxComment">#   instructions.</span>
+<span id="L30" class="LineNr">30 </span><span class="subxComment"># But on the other hand it would destroy the instruction cache, where this</span>
+<span id="L31" class="LineNr">31 </span><span class="subxComment"># approach requires 15 instructions, fixed.</span>
+<span id="L32" class="LineNr">32 </span>
+<span id="L33" class="LineNr">33 </span><span class="subxComment"># n must be positive</span>
+<span id="L34" class="LineNr">34 </span><span class="subxFunction">push-n-zero-bytes</span>:  <span class="subxComment"># n: int</span>
+<span id="L35" class="LineNr">35 </span><span class="Constant">$push-n-zero-bytes:prologue</span>:
+<span id="L36" class="LineNr">36 </span>    89/&lt;- *<span class="SpecialChar"><a href='302stack_allocate.subx.html#L56'>Push-n-zero-bytes-ebp</a></span> 5/r32/ebp  <span class="subxComment"># spill ebp without affecting stack</span>
+<span id="L37" class="LineNr">37 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L38" class="LineNr">38 </span><span class="Constant">$push-n-zero-bytes:copy-ra</span>:
+<span id="L39" class="LineNr">39 </span>    <span class="subxComment"># -- esp = ebp</span>
+<span id="L40" class="LineNr">40 </span>    89/&lt;- *<span class="SpecialChar"><a href='302stack_allocate.subx.html#L60'>Push-n-zero-bytes-eax</a></span> 0/r32/eax
+<span id="L41" class="LineNr">41 </span>    8b/-&gt; *esp 0/r32/eax
+<span id="L42" class="LineNr">42 </span>    2b/subtract *(ebp+4) 4/r32/esp
+<span id="L43" class="LineNr">43 </span>    <span class="subxComment"># -- esp+n = ebp</span>
+<span id="L44" class="LineNr">44 </span>    89/&lt;- *esp 0/r32/eax
+<span id="L45" class="LineNr">45 </span>    8b/-&gt; *<span class="SpecialChar"><a href='302stack_allocate.subx.html#L60'>Push-n-zero-bytes-eax</a></span> 0/r32/eax
+<span id="L46" class="LineNr">46 </span><span class="Constant">$push-n-zero-bytes:bulk-cleaning</span>:
+<span id="L47" class="LineNr">47 </span>    89/&lt;- *<span class="SpecialChar"><a href='302stack_allocate.subx.html#L58'>Push-n-zero-bytes-esp</a></span> 4/r32/esp
+<span id="L48" class="LineNr">48 </span>    81 0/subop/add *<span class="SpecialChar"><a href='302stack_allocate.subx.html#L58'>Push-n-zero-bytes-esp</a></span> 4/imm32
+<span id="L49" class="LineNr">49 </span>    81 0/subop/add *(ebp+4) 4/imm32
+<span id="L50" class="LineNr">50 </span>    (<a href='120allocate.subx.html#L6'>zero-out</a> *<span class="SpecialChar"><a href='302stack_allocate.subx.html#L58'>Push-n-zero-bytes-esp</a></span> *(ebp+4))  <span class="subxComment"># n+4</span>
+<span id="L51" class="LineNr">51 </span><span class="Constant">$push-n-zero-bytes:epilogue</span>:
+<span id="L52" class="LineNr">52 </span>    8b/-&gt; *<span class="SpecialChar"><a href='302stack_allocate.subx.html#L56'>Push-n-zero-bytes-ebp</a></span> 5/r32/ebp  <span class="subxComment"># restore spill</span>
+<span id="L53" class="LineNr">53 </span>    c3/return
+<span id="L54" class="LineNr">54 </span>
+<span id="L55" class="LineNr">55 </span>== data
+<span id="L56" class="LineNr">56 </span><span class="SpecialChar">Push-n-zero-bytes-ebp</span>:  <span class="subxComment"># (addr int)</span>
+<span id="L57" class="LineNr">57 </span>  0/imm32
+<span id="L58" class="LineNr">58 </span><span class="SpecialChar">Push-n-zero-bytes-esp</span>:  <span class="subxComment"># (addr int)</span>
+<span id="L59" class="LineNr">59 </span>  0/imm32
+<span id="L60" class="LineNr">60 </span><span class="SpecialChar">Push-n-zero-bytes-eax</span>:
+<span id="L61" class="LineNr">61 </span>  0/imm32
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/309stream.subx.html b/html/baremetal/309stream.subx.html
new file mode 100644
index 00000000..db4e04e1
--- /dev/null
+++ b/html/baremetal/309stream.subx.html
@@ -0,0 +1,260 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/309stream.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
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+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
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+.subxS1Comment { color: #0000af; }
+.subxFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
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+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
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+<a href='https://github.com/akkartik/mu/blob/main/baremetal/309stream.subx'>https://github.com/akkartik/mu/blob/main/baremetal/309stream.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Some unsafe methods not intended to be used directly in SubX, only through</span>
+<span id="L2" class="LineNr">  2 </span><span class="subxComment"># Mu after proper type-checking.</span>
+<span id="L3" class="LineNr">  3 </span>
+<span id="L4" class="LineNr">  4 </span>== code
+<span id="L5" class="LineNr">  5 </span>
+<span id="L6" class="LineNr">  6 </span><span class="subxFunction">stream-empty?</span>:  <span class="subxComment"># s: (addr stream _) -&gt; result/eax: boolean</span>
+<span id="L7" class="LineNr">  7 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L8" class="LineNr">  8 </span>    55/push-ebp
+<span id="L9" class="LineNr">  9 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L10" class="LineNr"> 10 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L11" class="LineNr"> 11 </span>    51/push-ecx
+<span id="L12" class="LineNr"> 12 </span>    56/push-esi
+<span id="L13" class="LineNr"> 13 </span>    <span class="subxComment"># result = false</span>
+<span id="L14" class="LineNr"> 14 </span>    b8/copy-to-eax 0/imm32/false
+<span id="L15" class="LineNr"> 15 </span>    <span class="subxComment"># esi = s</span>
+<span id="L16" class="LineNr"> 16 </span>    8b/-&gt; *(ebp+8) 6/r32/esi
+<span id="L17" class="LineNr"> 17 </span>    <span class="subxComment"># return s-&gt;read &gt;= s-&gt;write</span>
+<span id="L18" class="LineNr"> 18 </span>    8b/-&gt; *esi 1/r32/ecx
+<span id="L19" class="LineNr"> 19 </span>    39/compare-with *(esi+4) 1/r32/ecx
+<span id="L20" class="LineNr"> 20 </span>    0f 9d/set-if-&gt;= %al
+<span id="L21" class="LineNr"> 21 </span><span class="Constant">$stream-empty?:end</span>:
+<span id="L22" class="LineNr"> 22 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L23" class="LineNr"> 23 </span>    5e/pop-to-esi
+<span id="L24" class="LineNr"> 24 </span>    59/pop-to-ecx
+<span id="L25" class="LineNr"> 25 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L26" class="LineNr"> 26 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L27" class="LineNr"> 27 </span>    5d/pop-to-ebp
+<span id="L28" class="LineNr"> 28 </span>    c3/return
+<span id="L29" class="LineNr"> 29 </span>
+<span id="L30" class="LineNr"> 30 </span><span class="subxFunction">stream-full?</span>:  <span class="subxComment"># s: (addr stream _) -&gt; result/eax: boolean</span>
+<span id="L31" class="LineNr"> 31 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L32" class="LineNr"> 32 </span>    55/push-ebp
+<span id="L33" class="LineNr"> 33 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L34" class="LineNr"> 34 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L35" class="LineNr"> 35 </span>    51/push-ecx
+<span id="L36" class="LineNr"> 36 </span>    56/push-esi
+<span id="L37" class="LineNr"> 37 </span>    <span class="subxComment"># result = false</span>
+<span id="L38" class="LineNr"> 38 </span>    b8/copy-to-eax 0/imm32/false
+<span id="L39" class="LineNr"> 39 </span>    <span class="subxComment"># esi = s</span>
+<span id="L40" class="LineNr"> 40 </span>    8b/-&gt; *(ebp+8) 6/r32/esi
+<span id="L41" class="LineNr"> 41 </span>    <span class="subxComment"># return s-&gt;write &gt;= s-&gt;size</span>
+<span id="L42" class="LineNr"> 42 </span>    8b/-&gt; *(esi+8) 1/r32/ecx
+<span id="L43" class="LineNr"> 43 </span>    39/compare-with *esi 1/r32/ecx
+<span id="L44" class="LineNr"> 44 </span>    0f 9d/set-if-&gt;= %al
+<span id="L45" class="LineNr"> 45 </span><span class="Constant">$stream-full?:end</span>:
+<span id="L46" class="LineNr"> 46 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L47" class="LineNr"> 47 </span>    5e/pop-to-esi
+<span id="L48" class="LineNr"> 48 </span>    59/pop-to-ecx
+<span id="L49" class="LineNr"> 49 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L50" class="LineNr"> 50 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L51" class="LineNr"> 51 </span>    5d/pop-to-ebp
+<span id="L52" class="LineNr"> 52 </span>    c3/return
+<span id="L53" class="LineNr"> 53 </span>
+<span id="L54" class="LineNr"> 54 </span><span class="subxFunction">write-to-stream</span>:  <span class="subxComment"># s: (addr stream _), in: (addr byte), n: int</span>
+<span id="L55" class="LineNr"> 55 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L56" class="LineNr"> 56 </span>    55/push-ebp
+<span id="L57" class="LineNr"> 57 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L58" class="LineNr"> 58 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L59" class="LineNr"> 59 </span>    50/push-eax
+<span id="L60" class="LineNr"> 60 </span>    51/push-ecx
+<span id="L61" class="LineNr"> 61 </span>    52/push-edx
+<span id="L62" class="LineNr"> 62 </span>    53/push-ebx
+<span id="L63" class="LineNr"> 63 </span>    57/push-edi
+<span id="L64" class="LineNr"> 64 </span>    <span class="subxComment"># edi = s</span>
+<span id="L65" class="LineNr"> 65 </span>    8b/-&gt; *(ebp+8) 7/r32/edi
+<span id="L66" class="LineNr"> 66 </span>    <span class="subxComment"># var swrite/edx: int = s-&gt;write</span>
+<span id="L67" class="LineNr"> 67 </span>    8b/-&gt; *edi 2/r32/edx
+<span id="L68" class="LineNr"> 68 </span>    <span class="subxComment"># if (swrite + n &gt; s-&gt;size) return</span>
+<span id="L69" class="LineNr"> 69 </span>    8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L70" class="LineNr"> 70 </span>    01/add-to %ecx 2/r32/edx
+<span id="L71" class="LineNr"> 71 </span>    3b/compare 1/r32/ecx *(edi+8)
+<span id="L72" class="LineNr"> 72 </span>    0f 8f/jump-if-&gt; $write-to-stream:end/disp32  <span class="subxComment"># TODO: abort</span>
+<span id="L73" class="LineNr"> 73 </span>    <span class="subxComment"># var out/edx: (addr byte) = s-&gt;data + s-&gt;write</span>
+<span id="L74" class="LineNr"> 74 </span>    8d/copy-address *(edi+edx+0xc) 2/r32/edx
+<span id="L75" class="LineNr"> 75 </span>    <span class="subxComment"># var outend/ebx: (addr byte) = out + n</span>
+<span id="L76" class="LineNr"> 76 </span>    8b/-&gt; *(ebp+0x10) 3/r32/ebx
+<span id="L77" class="LineNr"> 77 </span>    8d/copy-address *(edx+ebx) 3/r32/ebx
+<span id="L78" class="LineNr"> 78 </span>    <span class="subxComment"># eax = in</span>
+<span id="L79" class="LineNr"> 79 </span>    8b/-&gt; *(ebp+0xc) 0/r32/eax
+<span id="L80" class="LineNr"> 80 </span>    <span class="subxComment"># var inend/ecx: (addr byte) = in + n</span>
+<span id="L81" class="LineNr"> 81 </span>    8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L82" class="LineNr"> 82 </span>    8d/copy-address *(eax+ecx) 1/r32/ecx
+<span id="L83" class="LineNr"> 83 </span>    <span class="subxComment">#</span>
+<span id="L84" class="LineNr"> 84 </span>    (<a href='107trace.subx.html#L38'>_append-4</a>  %edx %ebx  %eax %ecx)  <span class="subxComment"># =&gt; eax</span>
+<span id="L85" class="LineNr"> 85 </span>    <span class="subxComment"># s-&gt;write += n</span>
+<span id="L86" class="LineNr"> 86 </span>    8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L87" class="LineNr"> 87 </span>    01/add-to *edi 1/r32/ecx
+<span id="L88" class="LineNr"> 88 </span><span class="Constant">$write-to-stream:end</span>:
+<span id="L89" class="LineNr"> 89 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L90" class="LineNr"> 90 </span>    5f/pop-to-edi
+<span id="L91" class="LineNr"> 91 </span>    5b/pop-to-ebx
+<span id="L92" class="LineNr"> 92 </span>    5a/pop-to-edx
+<span id="L93" class="LineNr"> 93 </span>    59/pop-to-ecx
+<span id="L94" class="LineNr"> 94 </span>    58/pop-to-eax
+<span id="L95" class="LineNr"> 95 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L96" class="LineNr"> 96 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L97" class="LineNr"> 97 </span>    5d/pop-to-ebp
+<span id="L98" class="LineNr"> 98 </span>    c3/return
+<span id="L99" class="LineNr"> 99 </span>
+<span id="L100" class="LineNr">100 </span><span class="subxFunction">read-from-stream</span>:  <span class="subxComment"># s: (addr stream _), out: (addr byte), n: int</span>
+<span id="L101" class="LineNr">101 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L102" class="LineNr">102 </span>    55/push-ebp
+<span id="L103" class="LineNr">103 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L104" class="LineNr">104 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L105" class="LineNr">105 </span>    50/push-eax
+<span id="L106" class="LineNr">106 </span>    51/push-ecx
+<span id="L107" class="LineNr">107 </span>    52/push-edx
+<span id="L108" class="LineNr">108 </span>    53/push-ebx
+<span id="L109" class="LineNr">109 </span>    56/push-esi
+<span id="L110" class="LineNr">110 </span>    <span class="subxComment"># esi = s</span>
+<span id="L111" class="LineNr">111 </span>    8b/-&gt; *(ebp+8) 6/r32/esi
+<span id="L112" class="LineNr">112 </span>    <span class="subxComment"># var sread/edx: int = s-&gt;read</span>
+<span id="L113" class="LineNr">113 </span>    8b/-&gt; *(esi+4) 2/r32/edx
+<span id="L114" class="LineNr">114 </span>    <span class="subxComment"># if (sread + n &gt; s-&gt;write) return</span>
+<span id="L115" class="LineNr">115 </span>    8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L116" class="LineNr">116 </span>    01/add-to %ecx 2/r32/edx
+<span id="L117" class="LineNr">117 </span>    3b/compare 1/r32/ecx *esi
+<span id="L118" class="LineNr">118 </span>    0f 8f/jump-if-&gt; $read-from-stream:end/disp32  <span class="subxComment"># TODO: abort</span>
+<span id="L119" class="LineNr">119 </span>    <span class="subxComment"># var in/edx: (addr byte) = s-&gt;data + s-&gt;read</span>
+<span id="L120" class="LineNr">120 </span>    8d/copy-address *(esi+edx+0xc) 2/r32/edx
+<span id="L121" class="LineNr">121 </span>    <span class="subxComment"># var inend/ebx: (addr byte) = in + n</span>
+<span id="L122" class="LineNr">122 </span>    8b/-&gt; *(ebp+0x10) 3/r32/ebx
+<span id="L123" class="LineNr">123 </span>    8d/copy-address *(edx+ebx) 3/r32/ebx
+<span id="L124" class="LineNr">124 </span>    <span class="subxComment"># eax = out</span>
+<span id="L125" class="LineNr">125 </span>    8b/-&gt; *(ebp+0xc) 0/r32/eax
+<span id="L126" class="LineNr">126 </span>    <span class="subxComment"># var outend/ecx: (addr byte) = out + n</span>
+<span id="L127" class="LineNr">127 </span>    8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L128" class="LineNr">128 </span>    8d/copy-address *(eax+ecx) 1/r32/ecx
+<span id="L129" class="LineNr">129 </span>    <span class="subxComment">#</span>
+<span id="L130" class="LineNr">130 </span>    (<a href='107trace.subx.html#L38'>_append-4</a>  %eax %ecx  %edx %ebx)  <span class="subxComment"># =&gt; eax</span>
+<span id="L131" class="LineNr">131 </span>    <span class="subxComment"># s-&gt;read += n</span>
+<span id="L132" class="LineNr">132 </span>    8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L133" class="LineNr">133 </span>    01/add-to *(esi+4) 1/r32/ecx
+<span id="L134" class="LineNr">134 </span><span class="Constant">$read-from-stream:end</span>:
+<span id="L135" class="LineNr">135 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L136" class="LineNr">136 </span>    5e/pop-to-esi
+<span id="L137" class="LineNr">137 </span>    5b/pop-to-ebx
+<span id="L138" class="LineNr">138 </span>    5a/pop-to-edx
+<span id="L139" class="LineNr">139 </span>    59/pop-to-ecx
+<span id="L140" class="LineNr">140 </span>    58/pop-to-eax
+<span id="L141" class="LineNr">141 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L142" class="LineNr">142 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L143" class="LineNr">143 </span>    5d/pop-to-ebp
+<span id="L144" class="LineNr">144 </span>    c3/return
+<span id="L145" class="LineNr">145 </span>
+<span id="L146" class="LineNr">146 </span><span class="subxFunction">stream-first</span>:  <span class="subxComment"># s: (addr stream byte) -&gt; result/eax: byte</span>
+<span id="L147" class="LineNr">147 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L148" class="LineNr">148 </span>    55/push-ebp
+<span id="L149" class="LineNr">149 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L150" class="LineNr">150 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L151" class="LineNr">151 </span>    51/push-ecx
+<span id="L152" class="LineNr">152 </span>    56/push-esi
+<span id="L153" class="LineNr">153 </span>    <span class="subxComment"># result = false</span>
+<span id="L154" class="LineNr">154 </span>    b8/copy-to-eax 0/imm32
+<span id="L155" class="LineNr">155 </span>    <span class="subxComment"># esi = s</span>
+<span id="L156" class="LineNr">156 </span>    8b/-&gt; *(ebp+8) 6/r32/esi
+<span id="L157" class="LineNr">157 </span>    <span class="subxComment"># var idx/ecx: int = s-&gt;read</span>
+<span id="L158" class="LineNr">158 </span>    8b/-&gt; *(esi+4) 1/r32/ecx
+<span id="L159" class="LineNr">159 </span>    <span class="subxComment"># if idx &gt;= s-&gt;write return 0</span>
+<span id="L160" class="LineNr">160 </span>    3b/compare-with 1/r32/ecx *esi
+<span id="L161" class="LineNr">161 </span>    7d/jump-if-&gt;= $stream-first:end/disp8
+<span id="L162" class="LineNr">162 </span>    <span class="subxComment"># result = s-&gt;data[idx]</span>
+<span id="L163" class="LineNr">163 </span>    8a/byte-&gt; *(esi+ecx+0xc) 0/r32/AL
+<span id="L164" class="LineNr">164 </span><span class="Constant">$stream-first:end</span>:
+<span id="L165" class="LineNr">165 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L166" class="LineNr">166 </span>    5e/pop-to-esi
+<span id="L167" class="LineNr">167 </span>    59/pop-to-ecx
+<span id="L168" class="LineNr">168 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L169" class="LineNr">169 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L170" class="LineNr">170 </span>    5d/pop-to-ebp
+<span id="L171" class="LineNr">171 </span>    c3/return
+<span id="L172" class="LineNr">172 </span>
+<span id="L173" class="LineNr">173 </span><span class="subxFunction">stream-final</span>:  <span class="subxComment"># s: (addr stream byte) -&gt; result/eax: byte</span>
+<span id="L174" class="LineNr">174 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L175" class="LineNr">175 </span>    55/push-ebp
+<span id="L176" class="LineNr">176 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L177" class="LineNr">177 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L178" class="LineNr">178 </span>    51/push-ecx
+<span id="L179" class="LineNr">179 </span>    56/push-esi
+<span id="L180" class="LineNr">180 </span>    <span class="subxComment"># result = false</span>
+<span id="L181" class="LineNr">181 </span>    b8/copy-to-eax 0/imm32
+<span id="L182" class="LineNr">182 </span>    <span class="subxComment"># esi = s</span>
+<span id="L183" class="LineNr">183 </span>    8b/-&gt; *(ebp+8) 6/r32/esi
+<span id="L184" class="LineNr">184 </span>    <span class="subxComment"># var max/ecx: int = s-&gt;write</span>
+<span id="L185" class="LineNr">185 </span>    8b/-&gt; *esi 1/r32/ecx
+<span id="L186" class="LineNr">186 </span>    <span class="subxComment"># if s-&gt;read &gt;= max return 0</span>
+<span id="L187" class="LineNr">187 </span>    39/compare-with *(esi+4) 1/r32/ecx
+<span id="L188" class="LineNr">188 </span>    7d/jump-if-&gt;= $stream-final:end/disp8
+<span id="L189" class="LineNr">189 </span>    <span class="subxComment"># var idx/ecx: int = max - 1</span>
+<span id="L190" class="LineNr">190 </span>    49/decrement-ecx
+<span id="L191" class="LineNr">191 </span>    <span class="subxComment"># result = s-&gt;data[idx]</span>
+<span id="L192" class="LineNr">192 </span>    8a/byte-&gt; *(esi+ecx+0xc) 0/r32/AL
+<span id="L193" class="LineNr">193 </span><span class="Constant">$stream-final:end</span>:
+<span id="L194" class="LineNr">194 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L195" class="LineNr">195 </span>    5e/pop-to-esi
+<span id="L196" class="LineNr">196 </span>    59/pop-to-ecx
+<span id="L197" class="LineNr">197 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L198" class="LineNr">198 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L199" class="LineNr">199 </span>    5d/pop-to-ebp
+<span id="L200" class="LineNr">200 </span>    c3/return
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/313index-bounds-check.subx.html b/html/baremetal/313index-bounds-check.subx.html
new file mode 100644
index 00000000..e364e785
--- /dev/null
+++ b/html/baremetal/313index-bounds-check.subx.html
@@ -0,0 +1,71 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/313index-bounds-check.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
+.LineNr { }
+.subxS1Comment { color: #0000af; }
+.subxMinorFunction { color: #875f5f; }
+.Constant { color: #008787; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/313index-bounds-check.subx'>https://github.com/akkartik/mu/blob/main/baremetal/313index-bounds-check.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># TODO: bring this back</span>
+<span id="L2" class="LineNr"> 2 </span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxMinorFunction">__check-mu-array-bounds</span>:  <span class="subxComment"># index: int, elem-size: int, arr-size: int, function-name: (addr array byte), array-name: (addr array byte)</span>
+<span id="L4" class="LineNr"> 4 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L5" class="LineNr"> 5 </span>    55/push-ebp
+<span id="L6" class="LineNr"> 6 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L7" class="LineNr"> 7 </span><span class="Constant">$__check-mu-array-bounds:end</span>:
+<span id="L8" class="LineNr"> 8 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L9" class="LineNr"> 9 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L10" class="LineNr">10 </span>    5d/pop-to-ebp
+<span id="L11" class="LineNr">11 </span>    c3/return
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/400.mu.html b/html/baremetal/400.mu.html
index a2ee97a8..713534af 100644
--- a/html/baremetal/400.mu.html
+++ b/html/baremetal/400.mu.html
@@ -15,6 +15,7 @@ body { font-size:12pt; font-family: monospace; color: #000000; background-color:
 a { color:inherit; }
 * { font-size:12pt; font-size: 1em; }
 .LineNr { }
+.Constant { color: #008787; }
 .PreProc { color: #c000c0; }
 -->
 </style>
@@ -52,6 +53,13 @@ if ('onhashchange' in window) {
 <a href='https://github.com/akkartik/mu/blob/main/baremetal/400.mu'>https://github.com/akkartik/mu/blob/main/baremetal/400.mu</a>
 <pre id='vimCodeElement'>
 <span id="L1" class="LineNr">1 </span><span class="PreProc">sig</span> <a href='101screen.subx.html#L3'>pixel</a> screen: (addr screen), x: int, y: int, color: int
+<span id="L2" class="LineNr">2 </span><span class="PreProc">sig</span> <a href='102keyboard.subx.html#L3'>read-key</a> kbd: (addr keyboard)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: byte
+<span id="L3" class="LineNr">3 </span><span class="PreProc">sig</span> <a href='103grapheme.subx.html#L1'>draw-grapheme</a> screen: (addr screen), g: grapheme, x: int, y: int, color: int
+<span id="L4" class="LineNr">4 </span>
+<span id="L5" class="LineNr">5 </span><span class="PreProc">sig</span> <a href='108write.subx.html#L5'>write</a> f: (addr stream byte), s: (addr array byte)
+<span id="L6" class="LineNr">6 </span><span class="PreProc">sig</span> <a href='115write-byte.subx.html#L6'>append-byte</a> f: (addr stream byte), n: int
+<span id="L7" class="LineNr">7 </span><span class="PreProc">sig</span> <a href='112read-byte.subx.html#L5'>read-byte</a> s: (addr stream byte)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: byte
+<span id="L8" class="LineNr">8 </span><span class="PreProc">sig</span> <a href='309stream.subx.html#L6'>stream-empty?</a> s: (addr stream _)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: boolean
 </pre>
 </body>
 </html>
diff --git a/html/baremetal/403unicode.mu.html b/html/baremetal/403unicode.mu.html
new file mode 100644
index 00000000..35622877
--- /dev/null
+++ b/html/baremetal/403unicode.mu.html
@@ -0,0 +1,255 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/403unicode.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.muComment { color: #005faf; }
+.LineNr { }
+.SpecialChar { color: #d70000; }
+.Constant { color: #008787; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.Delimiter { color: #c000c0; }
+.PreProc { color: #c000c0; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/403unicode.mu'>https://github.com/akkartik/mu/blob/main/baremetal/403unicode.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">  1 </span><span class="muComment"># Helpers for Unicode.</span>
+<span id="L2" class="LineNr">  2 </span><span class="muComment">#</span>
+<span id="L3" class="LineNr">  3 </span><span class="muComment"># Mu has no characters, only code points and graphemes.</span>
+<span id="L4" class="LineNr">  4 </span><span class="muComment"># Code points are the indivisible atoms of text streams.</span>
+<span id="L5" class="LineNr">  5 </span><span class="muComment">#   <a href="https://en.wikipedia.org/wiki/Code_point">https://en.wikipedia.org/wiki/Code_point</a></span>
+<span id="L6" class="LineNr">  6 </span><span class="muComment"># Graphemes are the smallest self-contained unit of text.</span>
+<span id="L7" class="LineNr">  7 </span><span class="muComment"># Graphemes may consist of multiple code points.</span>
+<span id="L8" class="LineNr">  8 </span><span class="muComment">#</span>
+<span id="L9" class="LineNr">  9 </span><span class="muComment"># Mu graphemes are always represented in utf-8, and they are required to fit</span>
+<span id="L10" class="LineNr"> 10 </span><span class="muComment"># in 4 bytes.</span>
+<span id="L11" class="LineNr"> 11 </span><span class="muComment">#</span>
+<span id="L12" class="LineNr"> 12 </span><span class="muComment"># Mu doesn't currently support combining code points, or graphemes made of</span>
+<span id="L13" class="LineNr"> 13 </span><span class="muComment"># multiple code points. One day we will.</span>
+<span id="L14" class="LineNr"> 14 </span><span class="muComment"># We also don't currently support code points that translate into multiple</span>
+<span id="L15" class="LineNr"> 15 </span><span class="muComment"># or wide graphemes. (In particular, Tab will never be supported.)</span>
+<span id="L16" class="LineNr"> 16 </span>
+<span id="L17" class="LineNr"> 17 </span><span class="muComment"># transliterated from tb_utf8_unicode_to_char in <a href="https://github.com/nsf/termbox">https://github.com/nsf/termbox</a></span>
+<span id="L18" class="LineNr"> 18 </span><span class="muComment"># <a href="https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit">https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit</a> explains the algorithm</span>
+<span id="L19" class="LineNr"> 19 </span><span class="muComment">#</span>
+<span id="L20" class="LineNr"> 20 </span><span class="muComment"># The day we want to support combining characters, this function will need to</span>
+<span id="L21" class="LineNr"> 21 </span><span class="muComment"># take multiple code points. Or something.</span>
+<span id="L22" class="LineNr"> 22 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L22'>to-grapheme</a></span> in: code-point<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy in
+<span id="L24" class="LineNr"> 24 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="PreProc">var</span> first/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L26" class="LineNr"> 26 </span>  $to-grapheme:compute-length: <span class="Delimiter">{</span>
+<span id="L27" class="LineNr"> 27 </span>    <span class="muComment"># single byte: just return it</span>
+<span id="L28" class="LineNr"> 28 </span>    compare c, <span class="Constant">0x7f</span>
+<span id="L29" class="LineNr"> 29 </span>    <span class="Delimiter">{</span>
+<span id="L30" class="LineNr"> 30 </span>      <span class="PreProc">break-if-&gt;</span>
+<span id="L31" class="LineNr"> 31 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
+<span id="L32" class="LineNr"> 32 </span>      <span class="PreProc">return</span> g
+<span id="L33" class="LineNr"> 33 </span>    <span class="Delimiter">}</span>
+<span id="L34" class="LineNr"> 34 </span>    <span class="muComment"># 2 bytes</span>
+<span id="L35" class="LineNr"> 35 </span>    compare c, <span class="Constant">0x7ff</span>
+<span id="L36" class="LineNr"> 36 </span>    <span class="Delimiter">{</span>
+<span id="L37" class="LineNr"> 37 </span>      <span class="PreProc">break-if-&gt;</span>
+<span id="L38" class="LineNr"> 38 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
+<span id="L39" class="LineNr"> 39 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xc0</span>
+<span id="L40" class="LineNr"> 40 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
+<span id="L41" class="LineNr"> 41 </span>    <span class="Delimiter">}</span>
+<span id="L42" class="LineNr"> 42 </span>    <span class="muComment"># 3 bytes</span>
+<span id="L43" class="LineNr"> 43 </span>    compare c, <span class="Constant">0xffff</span>
+<span id="L44" class="LineNr"> 44 </span>    <span class="Delimiter">{</span>
+<span id="L45" class="LineNr"> 45 </span>      <span class="PreProc">break-if-&gt;</span>
+<span id="L46" class="LineNr"> 46 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">2</span>
+<span id="L47" class="LineNr"> 47 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xe0</span>
+<span id="L48" class="LineNr"> 48 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
+<span id="L49" class="LineNr"> 49 </span>    <span class="Delimiter">}</span>
+<span id="L50" class="LineNr"> 50 </span>    <span class="muComment"># 4 bytes</span>
+<span id="L51" class="LineNr"> 51 </span>    compare c, <span class="Constant">0x1fffff</span>
+<span id="L52" class="LineNr"> 52 </span>    <span class="Delimiter">{</span>
+<span id="L53" class="LineNr"> 53 </span>      <span class="PreProc">break-if-&gt;</span>
+<span id="L54" class="LineNr"> 54 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">3</span>
+<span id="L55" class="LineNr"> 55 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xf0</span>
+<span id="L56" class="LineNr"> 56 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
+<span id="L57" class="LineNr"> 57 </span>    <span class="Delimiter">}</span>
+<span id="L58" class="LineNr"> 58 </span>    <span class="muComment"># more than 4 bytes: unsupported</span>
+<span id="L59" class="LineNr"> 59 </span>    <span class="muComment"># TODO: print error message to stderr</span>
+<span id="L60" class="LineNr"> 60 </span>    compare c, <span class="Constant">0x1fffff</span>
+<span id="L61" class="LineNr"> 61 </span>    <span class="Delimiter">{</span>
+<span id="L62" class="LineNr"> 62 </span>      <span class="PreProc">break-if-&gt;</span>
+<span id="L63" class="LineNr"> 63 </span>      <span class="PreProc">return</span> <span class="Constant">0</span>
+<span id="L64" class="LineNr"> 64 </span>    <span class="Delimiter">}</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Delimiter">}</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="muComment"># emit trailer bytes, 6 bits from 'in', first two bits '10'</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Delimiter">{</span>
+<span id="L69" class="LineNr"> 69 </span>    compare num-trailers, <span class="Constant">0</span>
+<span id="L70" class="LineNr"> 70 </span>    <span class="PreProc">break-if-&lt;=</span>
+<span id="L71" class="LineNr"> 71 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">esi</span>: int <span class="SpecialChar">&lt;-</span> copy c
+<span id="L72" class="LineNr"> 72 </span>    tmp <span class="SpecialChar">&lt;-</span> and <span class="Constant">0x3f</span>
+<span id="L73" class="LineNr"> 73 </span>    tmp <span class="SpecialChar">&lt;-</span> or <span class="Constant">0x80</span>
+<span id="L74" class="LineNr"> 74 </span>    result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
+<span id="L75" class="LineNr"> 75 </span>    result <span class="SpecialChar">&lt;-</span> or tmp
+<span id="L76" class="LineNr"> 76 </span>    <span class="muComment"># update loop state</span>
+<span id="L77" class="LineNr"> 77 </span>    c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">6</span>
+<span id="L78" class="LineNr"> 78 </span>    num-trailers <span class="SpecialChar">&lt;-</span> decrement
+<span id="L79" class="LineNr"> 79 </span>    <span class="PreProc">loop</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Delimiter">}</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="muComment"># emit engine</span>
+<span id="L82" class="LineNr"> 82 </span>  result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
+<span id="L83" class="LineNr"> 83 </span>  result <span class="SpecialChar">&lt;-</span> or c
+<span id="L84" class="LineNr"> 84 </span>  result <span class="SpecialChar">&lt;-</span> or first
+<span id="L85" class="LineNr"> 85 </span>  <span class="muComment">#</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="PreProc">return</span> result
+<span id="L87" class="LineNr"> 87 </span><span class="Delimiter">}</span>
+<span id="L88" class="LineNr"> 88 </span>
+<span id="L89" class="LineNr"> 89 </span><span class="muComment"># TODO: bring in tests once we have check-ints-equal</span>
+<span id="L90" class="LineNr"> 90 </span>
+<span id="L91" class="LineNr"> 91 </span><span class="muComment"># read the next grapheme from a stream of bytes</span>
+<span id="L92" class="LineNr"> 92 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L92'>read-grapheme</a></span> in: (addr stream byte)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="muComment"># if at eof, return EOF</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Delimiter">{</span>
+<span id="L95" class="LineNr"> 95 </span>    <span class="PreProc">var</span> eof?/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> in
+<span id="L96" class="LineNr"> 96 </span>    compare eof?, <span class="Constant">0</span>  <span class="muComment"># false</span>
+<span id="L97" class="LineNr"> 97 </span>    <span class="PreProc">break-if-=</span>
+<span id="L98" class="LineNr"> 98 </span>    <span class="PreProc">return</span> <span class="Constant">0xffffffff</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Delimiter">}</span>
+<span id="L100" class="LineNr">100 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='112read-byte.subx.html#L5'>read-byte</a> in
+<span id="L101" class="LineNr">101 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L102" class="LineNr">102 </span>  $read-grapheme:compute-length: <span class="Delimiter">{</span>
+<span id="L103" class="LineNr">103 </span>    <span class="muComment"># single byte: just return it</span>
+<span id="L104" class="LineNr">104 </span>    compare c, <span class="Constant">0xc0</span>
+<span id="L105" class="LineNr">105 </span>    <span class="Delimiter">{</span>
+<span id="L106" class="LineNr">106 </span>      <span class="PreProc">break-if-&gt;=</span>
+<span id="L107" class="LineNr">107 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
+<span id="L108" class="LineNr">108 </span>      <span class="PreProc">return</span> g
+<span id="L109" class="LineNr">109 </span>    <span class="Delimiter">}</span>
+<span id="L110" class="LineNr">110 </span>    compare c, <span class="Constant">0xfe</span>
+<span id="L111" class="LineNr">111 </span>    <span class="Delimiter">{</span>
+<span id="L112" class="LineNr">112 </span>      <span class="PreProc">break-if-&lt;</span>
+<span id="L113" class="LineNr">113 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
+<span id="L114" class="LineNr">114 </span>      <span class="PreProc">return</span> g
+<span id="L115" class="LineNr">115 </span>    <span class="Delimiter">}</span>
+<span id="L116" class="LineNr">116 </span>    <span class="muComment"># 2 bytes</span>
+<span id="L117" class="LineNr">117 </span>    compare c, <span class="Constant">0xe0</span>
+<span id="L118" class="LineNr">118 </span>    <span class="Delimiter">{</span>
+<span id="L119" class="LineNr">119 </span>      <span class="PreProc">break-if-&gt;=</span>
+<span id="L120" class="LineNr">120 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
+<span id="L121" class="LineNr">121 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
+<span id="L122" class="LineNr">122 </span>    <span class="Delimiter">}</span>
+<span id="L123" class="LineNr">123 </span>    <span class="muComment"># 3 bytes</span>
+<span id="L124" class="LineNr">124 </span>    compare c, <span class="Constant">0xf0</span>
+<span id="L125" class="LineNr">125 </span>    <span class="Delimiter">{</span>
+<span id="L126" class="LineNr">126 </span>      <span class="PreProc">break-if-&gt;=</span>
+<span id="L127" class="LineNr">127 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">2</span>
+<span id="L128" class="LineNr">128 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
+<span id="L129" class="LineNr">129 </span>    <span class="Delimiter">}</span>
+<span id="L130" class="LineNr">130 </span>    <span class="muComment"># 4 bytes</span>
+<span id="L131" class="LineNr">131 </span>    compare c, <span class="Constant">0xf8</span>
+<span id="L132" class="LineNr">132 </span>    <span class="Delimiter">{</span>
+<span id="L133" class="LineNr">133 </span>      <span class="PreProc">break-if-&gt;=</span>
+<span id="L134" class="LineNr">134 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">3</span>
+<span id="L135" class="LineNr">135 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
+<span id="L136" class="LineNr">136 </span>    <span class="Delimiter">}</span>
+<span id="L137" class="LineNr">137 </span>    <span class="muComment"># TODO: print error message</span>
+<span id="L138" class="LineNr">138 </span>    <span class="PreProc">return</span> <span class="Constant">0</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
+<span id="L140" class="LineNr">140 </span>  <span class="muComment"># prepend trailer bytes</span>
+<span id="L141" class="LineNr">141 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
+<span id="L142" class="LineNr">142 </span>  <span class="PreProc">var</span> num-byte-shifts/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Delimiter">{</span>
+<span id="L144" class="LineNr">144 </span>    compare num-trailers, <span class="Constant">0</span>
+<span id="L145" class="LineNr">145 </span>    <span class="PreProc">break-if-&lt;=</span>
+<span id="L146" class="LineNr">146 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='112read-byte.subx.html#L5'>read-byte</a> in
+<span id="L147" class="LineNr">147 </span>    <span class="PreProc">var</span> tmp2/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy tmp
+<span id="L148" class="LineNr">148 </span>    tmp2 <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L159'>shift-left-bytes</a> tmp2, num-byte-shifts
+<span id="L149" class="LineNr">149 </span>    result <span class="SpecialChar">&lt;-</span> or tmp2
+<span id="L150" class="LineNr">150 </span>    <span class="muComment"># update loop state</span>
+<span id="L151" class="LineNr">151 </span>    num-byte-shifts <span class="SpecialChar">&lt;-</span> increment
+<span id="L152" class="LineNr">152 </span>    num-trailers <span class="SpecialChar">&lt;-</span> decrement
+<span id="L153" class="LineNr">153 </span>    <span class="PreProc">loop</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Delimiter">}</span>
+<span id="L155" class="LineNr">155 </span>  <span class="PreProc">return</span> result
+<span id="L156" class="LineNr">156 </span><span class="Delimiter">}</span>
+<span id="L157" class="LineNr">157 </span>
+<span id="L158" class="LineNr">158 </span><span class="muComment"># needed because available primitives only shift by a literal/constant number of bits</span>
+<span id="L159" class="LineNr">159 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L159'>shift-left-bytes</a></span> n: int, k: int<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
+<span id="L160" class="LineNr">160 </span>  <span class="PreProc">var</span> i/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L161" class="LineNr">161 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy n
+<span id="L162" class="LineNr">162 </span>  <span class="Delimiter">{</span>
+<span id="L163" class="LineNr">163 </span>    compare i, k
+<span id="L164" class="LineNr">164 </span>    <span class="PreProc">break-if-&gt;=</span>
+<span id="L165" class="LineNr">165 </span>    compare i, <span class="Constant">4</span>  <span class="muComment"># only 4 bytes in 32 bits</span>
+<span id="L166" class="LineNr">166 </span>    <span class="PreProc">break-if-&gt;=</span>
+<span id="L167" class="LineNr">167 </span>    result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
+<span id="L168" class="LineNr">168 </span>    i <span class="SpecialChar">&lt;-</span> increment
+<span id="L169" class="LineNr">169 </span>    <span class="PreProc">loop</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Delimiter">}</span>
+<span id="L171" class="LineNr">171 </span>  <span class="PreProc">return</span> result
+<span id="L172" class="LineNr">172 </span><span class="Delimiter">}</span>
+<span id="L173" class="LineNr">173 </span>
+<span id="L174" class="LineNr">174 </span><span class="muComment"># write a grapheme to a stream of bytes</span>
+<span id="L175" class="LineNr">175 </span><span class="muComment"># this is like write-to-stream, except we skip leading 0 bytes</span>
+<span id="L176" class="LineNr">176 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L176'>write-grapheme</a></span> out: (addr stream byte), g: grapheme <span class="Delimiter">{</span>
+<span id="L177" class="LineNr">177 </span>$write-grapheme:body: <span class="Delimiter">{</span>
+<span id="L178" class="LineNr">178 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy g
+<span id="L179" class="LineNr">179 </span>  <a href='115write-byte.subx.html#L6'>append-byte</a> out, c  <span class="muComment"># first byte is always written</span>
+<span id="L180" class="LineNr">180 </span>  c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">8</span>
+<span id="L181" class="LineNr">181 </span>  compare c, <span class="Constant">0</span>
+<span id="L182" class="LineNr">182 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
+<span id="L183" class="LineNr">183 </span>  <a href='115write-byte.subx.html#L6'>append-byte</a> out, c
+<span id="L184" class="LineNr">184 </span>  c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">8</span>
+<span id="L185" class="LineNr">185 </span>  compare c, <span class="Constant">0</span>
+<span id="L186" class="LineNr">186 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
+<span id="L187" class="LineNr">187 </span>  <a href='115write-byte.subx.html#L6'>append-byte</a> out, c
+<span id="L188" class="LineNr">188 </span>  c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">8</span>
+<span id="L189" class="LineNr">189 </span>  compare c, <span class="Constant">0</span>
+<span id="L190" class="LineNr">190 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
+<span id="L191" class="LineNr">191 </span>  <a href='115write-byte.subx.html#L6'>append-byte</a> out, c
+<span id="L192" class="LineNr">192 </span><span class="Delimiter">}</span>
+<span id="L193" class="LineNr">193 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/501draw-text-rightward.mu.html b/html/baremetal/501draw-text-rightward.mu.html
new file mode 100644
index 00000000..be906a43
--- /dev/null
+++ b/html/baremetal/501draw-text-rightward.mu.html
@@ -0,0 +1,75 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/501draw-text-rightward.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.muComment { color: #005faf; }
+.LineNr { }
+.SpecialChar { color: #d70000; }
+.Delimiter { color: #c000c0; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
+.PreProc { color: #c000c0; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/501draw-text-rightward.mu'>https://github.com/akkartik/mu/blob/main/baremetal/501draw-text-rightward.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='501draw-text-rightward.mu.html#L1'>draw-text-rightward</a></span> screen: (addr screen), text: (addr array byte), x: int, y: int, color: int <span class="Delimiter">{</span>
+<span id="L2" class="LineNr"> 2 </span>  <span class="PreProc">var</span> stream-storage: (stream byte <span class="Constant">0x100</span>)
+<span id="L3" class="LineNr"> 3 </span>  <span class="PreProc">var</span> stream/<span class="Constant">esi</span>: (addr stream byte) <span class="SpecialChar">&lt;-</span> address stream-storage
+<span id="L4" class="LineNr"> 4 </span>  <a href='108write.subx.html#L5'>write</a> stream, text
+<span id="L5" class="LineNr"> 5 </span>  <span class="Delimiter">{</span>
+<span id="L6" class="LineNr"> 6 </span>    <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L92'>read-grapheme</a> stream
+<span id="L7" class="LineNr"> 7 </span>    compare g, <span class="Constant">0xffffffff</span>  <span class="muComment"># end-of-file</span>
+<span id="L8" class="LineNr"> 8 </span>    <span class="PreProc">break-if-=</span>
+<span id="L9" class="LineNr"> 9 </span>    <a href='103grapheme.subx.html#L1'>draw-grapheme</a> screen, g, x, y, color
+<span id="L10" class="LineNr">10 </span>    add-to x, <span class="Constant">8</span>  <span class="muComment"># font-width</span>
+<span id="L11" class="LineNr">11 </span>    <span class="PreProc">loop</span>
+<span id="L12" class="LineNr">12 </span>  <span class="Delimiter">}</span>
+<span id="L13" class="LineNr">13 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/boot.hex.html b/html/baremetal/boot.hex.html
index e4a54cfb..4b696da1 100644
--- a/html/baremetal/boot.hex.html
+++ b/html/baremetal/boot.hex.html
@@ -17,6 +17,7 @@ a { color:inherit; }
 .subxComment { color: #005faf; }
 .LineNr { }
 .subxS1Comment { color: #0000af; }
+.Folded { color: #080808; background-color: #949494; }
 -->
 </style>
 
@@ -52,7 +53,7 @@ if ('onhashchange' in window) {
 <body onload='JumpToLine();'>
 <a href='https://github.com/akkartik/mu/blob/main/baremetal/boot.hex'>https://github.com/akkartik/mu/blob/main/baremetal/boot.hex</a>
 <pre id='vimCodeElement'>
-<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Code for the first 2 disk sectors, that all programs in this directory need:</span>
+<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Code for the first disk sector that all programs in this directory need:</span>
 <span id="L2" class="LineNr">  2 </span><span class="subxComment">#   - load sectors past the first (using BIOS primitives) since only the first is available by default</span>
 <span id="L3" class="LineNr">  3 </span><span class="subxComment">#     - if this fails, print 'D' at top-left of screen and halt</span>
 <span id="L4" class="LineNr">  4 </span><span class="subxComment">#   - initialize a minimal graphics mode</span>
@@ -85,7 +86,7 @@ if ('onhashchange' in window) {
 <span id="L31" class="LineNr"> 31 </span><span class="subxComment">#   - can't use any syscalls</span>
 <span id="L32" class="LineNr"> 32 </span><span class="subxComment">#   - can't print text to video memory (past these boot sectors)</span>
 <span id="L33" class="LineNr"> 33 </span><span class="subxComment">#   - must only print raw pixels (256 colors) to video memory (resolution 1024x768)</span>
-<span id="L34" class="LineNr"> 34 </span><span class="subxComment">#   - must store their entry-point at address 0x8800</span>
+<span id="L34" class="LineNr"> 34 </span><span class="subxComment">#   - must store their entry-point at address 0x9000</span>
 <span id="L35" class="LineNr"> 35 </span>
 <span id="L36" class="LineNr"> 36 </span><span class="subxComment">## 16-bit entry point</span>
 <span id="L37" class="LineNr"> 37 </span>
@@ -118,7 +119,7 @@ if ('onhashchange' in window) {
 <span id="L64" class="LineNr"> 64 </span>  b5 00  <span class="subxComment"># ch &lt;- 0  # cylinder 0</span>
 <span id="L65" class="LineNr"> 65 </span>  b6 00  <span class="subxComment"># dh &lt;- 0  # track 0</span>
 <span id="L66" class="LineNr"> 66 </span>  b1 02  <span class="subxComment"># cl &lt;- 2  # second sector, 1-based</span>
-<span id="L67" class="LineNr"> 67 </span>  b0 10  <span class="subxComment"># al &lt;- 16  # number of sectors to read; all sectors must be in a single track</span>
+<span id="L67" class="LineNr"> 67 </span>  b0 20  <span class="subxComment"># al &lt;- 32  # number of sectors to read; all sectors must be in a single track</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="subxComment"># address to write sectors to = es:bx = 0x7e00, contiguous with boot segment</span>
 <span id="L69" class="LineNr"> 69 </span>  bb 00 00  <span class="subxComment"># bx &lt;- 0</span>
 <span id="L70" class="LineNr"> 70 </span>  8e c3  <span class="subxComment"># es &lt;- bx</span>
@@ -259,7 +260,7 @@ if ('onhashchange' in window) {
 <span id="L205" class="LineNr">205 </span>
 <span id="L206" class="LineNr">206 </span>  <span class="subxComment"># initialization is done; enable interrupts</span>
 <span id="L207" class="LineNr">207 </span>  fb
-<span id="L208" class="LineNr">208 </span>  e9 01 0b 00 00  <span class="subxComment"># jump to 0x8800 [label]</span>
+<span id="L208" class="LineNr">208 </span>  e9 01 13 00 00  <span class="subxComment"># jump to 0x9000 [label]</span>
 <span id="L209" class="LineNr">209 </span>
 <span id="L210" class="LineNr">210 </span><span class="subxComment"># padding</span>
 <span id="L211" class="LineNr">211 </span><span class="subxComment"># ff:</span>
@@ -294,7 +295,7 @@ if ('onhashchange' in window) {
 <span id="L240" class="LineNr">240 </span>  <span class="subxS1Comment"># . var index/ecx: byte</span>
 <span id="L241" class="LineNr">241 </span>  8a  <span class="subxComment"># copy m8 at r32 to r8</span>
 <span id="L242" class="LineNr">242 </span>    0d  <span class="subxComment"># 00/mod/indirect 001/r8/cl 101/rm32/use-disp32</span>
-<span id="L243" class="LineNr">243 </span>    ce 7d 00 00  <span class="subxComment"># disp32 [label]</span>
+<span id="L243" class="LineNr">243 </span>    c8 7d 00 00  <span class="subxComment"># disp32 [label]</span>
 <span id="L244" class="LineNr">244 </span>  <span class="subxS1Comment"># . al = *(keyboard buffer + index)</span>
 <span id="L245" class="LineNr">245 </span>  8a  <span class="subxComment"># copy m8 at r32 to r8</span>
 <span id="L246" class="LineNr">246 </span>    81  <span class="subxComment"># 10/mod/*+disp32 000/r8/al 001/rm32/ecx</span>
@@ -324,11 +325,11 @@ if ('onhashchange' in window) {
 <span id="L270" class="LineNr">270 </span>  <span class="subxComment"># increment index</span>
 <span id="L271" class="LineNr">271 </span>  fe  <span class="subxComment"># increment byte</span>
 <span id="L272" class="LineNr">272 </span>    05  <span class="subxComment"># 00/mod/indirect 000/subop/increment 101/rm32/use-disp32</span>
-<span id="L273" class="LineNr">273 </span>    ce 7d 00 00  <span class="subxComment"># disp32 [label]</span>
+<span id="L273" class="LineNr">273 </span>    c8 7d 00 00  <span class="subxComment"># disp32 [label]</span>
 <span id="L274" class="LineNr">274 </span>  <span class="subxComment"># clear top nibble of index (keyboard buffer is circular)</span>
 <span id="L275" class="LineNr">275 </span>  80  <span class="subxComment"># and byte</span>
 <span id="L276" class="LineNr">276 </span>    25  <span class="subxComment"># 00/mod/indirect 100/subop/and 101/rm32/use-disp32</span>
-<span id="L277" class="LineNr">277 </span>    ce 7d 00 00  <span class="subxComment"># disp32 [label]</span>
+<span id="L277" class="LineNr">277 </span>    c8 7d 00 00  <span class="subxComment"># disp32 [label]</span>
 <span id="L278" class="LineNr">278 </span>    0f  <span class="subxComment"># imm8</span>
 <span id="L279" class="LineNr">279 </span><span class="subxComment"># 155:</span>
 <span id="L280" class="LineNr">280 </span>  <span class="subxComment"># epilogue</span>
@@ -345,65 +346,65 @@ if ('onhashchange' in window) {
 <span id="L291" class="LineNr">291 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 <span id="L292" class="LineNr">292 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 <span id="L293" class="LineNr">293 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L294" class="LineNr">294 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00
+<span id="L294" class="LineNr">294 </span>00 00 00 00 00 00 00 00
 <span id="L295" class="LineNr">295 </span>
-<span id="L296" class="LineNr">296 </span><span class="subxComment"># 1ce:</span>
+<span id="L296" class="LineNr">296 </span><span class="subxComment"># 1c8:</span>
 <span id="L297" class="LineNr">297 </span><span class="subxComment"># var keyboard circular buffer</span>
 <span id="L298" class="LineNr">298 </span><span class="subxComment"># write index: nibble</span>
-<span id="L299" class="LineNr">299 </span>  00
-<span id="L300" class="LineNr">300 </span><span class="subxComment"># 1cf:</span>
-<span id="L301" class="LineNr">301 </span><span class="subxComment"># read index: nibble</span>
-<span id="L302" class="LineNr">302 </span>  00
-<span id="L303" class="LineNr">303 </span><span class="subxComment"># circular buffer: byte[16]</span>
-<span id="L304" class="LineNr">304 </span>  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L305" class="LineNr">305 </span>
-<span id="L306" class="LineNr">306 </span><span class="subxComment"># padding</span>
-<span id="L307" class="LineNr">307 </span><span class="subxComment"># 1e0:</span>
-<span id="L308" class="LineNr">308 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L309" class="LineNr">309 </span>00 00 00 00 00 00 00 00
-<span id="L310" class="LineNr">310 </span>
-<span id="L311" class="LineNr">311 </span><span class="subxComment"># 1f8:</span>
-<span id="L312" class="LineNr">312 </span><span class="subxComment"># idt_descriptor:</span>
-<span id="L313" class="LineNr">313 </span>  ff 00  <span class="subxComment"># idt_end - idt_start - 1</span>
-<span id="L314" class="LineNr">314 </span>  00 7e 00 00  <span class="subxComment"># start = idt_start [label]</span>
-<span id="L315" class="LineNr">315 </span>
-<span id="L316" class="LineNr">316 </span><span class="subxComment"># 1fe:</span>
-<span id="L317" class="LineNr">317 </span><span class="subxComment"># final 2 bytes of boot sector</span>
-<span id="L318" class="LineNr">318 </span>55 aa
-<span id="L319" class="LineNr">319 </span>
-<span id="L320" class="LineNr">320 </span><span class="subxComment">## sector 2</span>
-<span id="L321" class="LineNr">321 </span><span class="subxComment"># loaded by load_disk, not automatically on boot</span>
+<span id="L299" class="LineNr">299 </span><span class="subxComment"># still take up 4 bytes so SubX can handle it</span>
+<span id="L300" class="LineNr">300 </span>  00 00 00 00
+<span id="L301" class="LineNr">301 </span><span class="subxComment"># 1cc:</span>
+<span id="L302" class="LineNr">302 </span><span class="subxComment"># read index: nibble</span>
+<span id="L303" class="LineNr">303 </span><span class="subxComment"># still take up 4 bytes so SubX can handle it</span>
+<span id="L304" class="LineNr">304 </span>  00 00 00 00
+<span id="L305" class="LineNr">305 </span><span class="subxComment"># 1d0:</span>
+<span id="L306" class="LineNr">306 </span><span class="subxComment"># circular buffer: byte[16]</span>
+<span id="L307" class="LineNr">307 </span>  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+<span id="L308" class="LineNr">308 </span>
+<span id="L309" class="LineNr">309 </span><span class="subxComment"># padding</span>
+<span id="L310" class="LineNr">310 </span><span class="subxComment"># 1e0:</span>
+<span id="L311" class="LineNr">311 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+<span id="L312" class="LineNr">312 </span>00 00 00 00 00 00 00 00
+<span id="L313" class="LineNr">313 </span>
+<span id="L314" class="LineNr">314 </span><span class="subxComment"># 1f8:</span>
+<span id="L315" class="LineNr">315 </span><span class="subxComment"># idt_descriptor:</span>
+<span id="L316" class="LineNr">316 </span>  ff 00  <span class="subxComment"># idt_end - idt_start - 1</span>
+<span id="L317" class="LineNr">317 </span>  00 7e 00 00  <span class="subxComment"># start = idt_start [label]</span>
+<span id="L318" class="LineNr">318 </span>
+<span id="L319" class="LineNr">319 </span><span class="subxComment"># 1fe:</span>
+<span id="L320" class="LineNr">320 </span><span class="subxComment"># final 2 bytes of boot sector</span>
+<span id="L321" class="LineNr">321 </span>55 aa
 <span id="L322" class="LineNr">322 </span>
-<span id="L323" class="LineNr">323 </span><span class="subxComment"># offset 200 (address 0x7e00): interrupt descriptor table</span>
-<span id="L324" class="LineNr">324 </span><span class="subxComment"># 32 entries * 8 bytes each = 256 bytes (0x100)</span>
-<span id="L325" class="LineNr">325 </span><span class="subxComment"># idt_start:</span>
-<span id="L326" class="LineNr">326 </span>
-<span id="L327" class="LineNr">327 </span>00 00 00 00 00 00 00 00
-<span id="L328" class="LineNr">328 </span>00 00 00 00 00 00 00 00
-<span id="L329" class="LineNr">329 </span>00 00 00 00 00 00 00 00
+<span id="L323" class="LineNr">323 </span><span class="subxComment">## sector 2</span>
+<span id="L324" class="LineNr">324 </span><span class="subxComment"># loaded by load_disk, not automatically on boot</span>
+<span id="L325" class="LineNr">325 </span>
+<span id="L326" class="LineNr">326 </span><span class="subxComment"># offset 200 (address 0x7e00): interrupt descriptor table</span>
+<span id="L327" class="LineNr">327 </span><span class="subxComment"># 32 entries * 8 bytes each = 256 bytes (0x100)</span>
+<span id="L328" class="LineNr">328 </span><span class="subxComment"># idt_start:</span>
+<span id="L329" class="LineNr">329 </span>
 <span id="L330" class="LineNr">330 </span>00 00 00 00 00 00 00 00
 <span id="L331" class="LineNr">331 </span>00 00 00 00 00 00 00 00
 <span id="L332" class="LineNr">332 </span>00 00 00 00 00 00 00 00
 <span id="L333" class="LineNr">333 </span>00 00 00 00 00 00 00 00
 <span id="L334" class="LineNr">334 </span>00 00 00 00 00 00 00 00
-<span id="L335" class="LineNr">335 </span>
-<span id="L336" class="LineNr">336 </span><span class="subxComment"># entry 8: clock</span>
-<span id="L337" class="LineNr">337 </span>  00 7d  <span class="subxComment"># target[0:16] = null interrupt handler [label]</span>
-<span id="L338" class="LineNr">338 </span>  08 00  <span class="subxComment"># segment selector (gdt_code)</span>
-<span id="L339" class="LineNr">339 </span>  00  <span class="subxComment"># unused</span>
-<span id="L340" class="LineNr">340 </span>  8e  <span class="subxComment"># 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate</span>
-<span id="L341" class="LineNr">341 </span>  00 00  <span class="subxComment"># target[16:32]</span>
-<span id="L342" class="LineNr">342 </span>
-<span id="L343" class="LineNr">343 </span><span class="subxComment"># entry 9: keyboard</span>
-<span id="L344" class="LineNr">344 </span>  10 7d  <span class="subxComment"># target[0:16] = keyboard interrupt handler [label]</span>
-<span id="L345" class="LineNr">345 </span>  08 00  <span class="subxComment"># segment selector (gdt_code)</span>
-<span id="L346" class="LineNr">346 </span>  00  <span class="subxComment"># unused</span>
-<span id="L347" class="LineNr">347 </span>  8e  <span class="subxComment"># 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate</span>
-<span id="L348" class="LineNr">348 </span>  00 00  <span class="subxComment"># target[16:32]</span>
-<span id="L349" class="LineNr">349 </span>
-<span id="L350" class="LineNr">350 </span>00 00 00 00 00 00 00 00
-<span id="L351" class="LineNr">351 </span>00 00 00 00 00 00 00 00
-<span id="L352" class="LineNr">352 </span>00 00 00 00 00 00 00 00
+<span id="L335" class="LineNr">335 </span>00 00 00 00 00 00 00 00
+<span id="L336" class="LineNr">336 </span>00 00 00 00 00 00 00 00
+<span id="L337" class="LineNr">337 </span>00 00 00 00 00 00 00 00
+<span id="L338" class="LineNr">338 </span>
+<span id="L339" class="LineNr">339 </span><span class="subxComment"># entry 8: clock</span>
+<span id="L340" class="LineNr">340 </span>  00 7d  <span class="subxComment"># target[0:16] = null interrupt handler [label]</span>
+<span id="L341" class="LineNr">341 </span>  08 00  <span class="subxComment"># segment selector (gdt_code)</span>
+<span id="L342" class="LineNr">342 </span>  00  <span class="subxComment"># unused</span>
+<span id="L343" class="LineNr">343 </span>  8e  <span class="subxComment"># 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate</span>
+<span id="L344" class="LineNr">344 </span>  00 00  <span class="subxComment"># target[16:32]</span>
+<span id="L345" class="LineNr">345 </span>
+<span id="L346" class="LineNr">346 </span><span class="subxComment"># entry 9: keyboard</span>
+<span id="L347" class="LineNr">347 </span>  10 7d  <span class="subxComment"># target[0:16] = keyboard interrupt handler [label]</span>
+<span id="L348" class="LineNr">348 </span>  08 00  <span class="subxComment"># segment selector (gdt_code)</span>
+<span id="L349" class="LineNr">349 </span>  00  <span class="subxComment"># unused</span>
+<span id="L350" class="LineNr">350 </span>  8e  <span class="subxComment"># 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate</span>
+<span id="L351" class="LineNr">351 </span>  00 00  <span class="subxComment"># target[16:32]</span>
+<span id="L352" class="LineNr">352 </span>
 <span id="L353" class="LineNr">353 </span>00 00 00 00 00 00 00 00
 <span id="L354" class="LineNr">354 </span>00 00 00 00 00 00 00 00
 <span id="L355" class="LineNr">355 </span>00 00 00 00 00 00 00 00
@@ -423,51 +424,51 @@ if ('onhashchange' in window) {
 <span id="L369" class="LineNr">369 </span>00 00 00 00 00 00 00 00
 <span id="L370" class="LineNr">370 </span>00 00 00 00 00 00 00 00
 <span id="L371" class="LineNr">371 </span>00 00 00 00 00 00 00 00
-<span id="L372" class="LineNr">372 </span><span class="subxComment"># idt_end:</span>
-<span id="L373" class="LineNr">373 </span>
-<span id="L374" class="LineNr">374 </span><span class="subxComment"># offset 300 (address 0x7f00):</span>
-<span id="L375" class="LineNr">375 </span><span class="subxComment"># video mode info:</span>
-<span id="L376" class="LineNr">376 </span>  00 00  <span class="subxComment"># attributes</span>
-<span id="L377" class="LineNr">377 </span>  00  <span class="subxComment"># winA</span>
-<span id="L378" class="LineNr">378 </span>  00  <span class="subxComment"># winB</span>
-<span id="L379" class="LineNr">379 </span><span class="subxComment"># 304</span>
-<span id="L380" class="LineNr">380 </span>  00 00  <span class="subxComment"># granularity</span>
-<span id="L381" class="LineNr">381 </span>  00 00  <span class="subxComment"># winsize</span>
-<span id="L382" class="LineNr">382 </span><span class="subxComment"># 308</span>
-<span id="L383" class="LineNr">383 </span>  00 00  <span class="subxComment"># segmentA</span>
-<span id="L384" class="LineNr">384 </span>  00 00  <span class="subxComment"># segmentB</span>
-<span id="L385" class="LineNr">385 </span><span class="subxComment"># 30c</span>
-<span id="L386" class="LineNr">386 </span>  00 00 00 00  <span class="subxComment"># realFctPtr (who knows)</span>
-<span id="L387" class="LineNr">387 </span><span class="subxComment"># 310</span>
-<span id="L388" class="LineNr">388 </span>  00 00  <span class="subxComment"># pitch</span>
-<span id="L389" class="LineNr">389 </span>  00 00  <span class="subxComment"># Xres</span>
-<span id="L390" class="LineNr">390 </span><span class="subxComment"># 314</span>
-<span id="L391" class="LineNr">391 </span>  00 00  <span class="subxComment"># Yres</span>
-<span id="L392" class="LineNr">392 </span>  00 00  <span class="subxComment"># Wchar Ychar</span>
-<span id="L393" class="LineNr">393 </span><span class="subxComment"># 318</span>
-<span id="L394" class="LineNr">394 </span>  00  <span class="subxComment"># planes</span>
-<span id="L395" class="LineNr">395 </span>  00  <span class="subxComment"># bpp</span>
-<span id="L396" class="LineNr">396 </span>  00  <span class="subxComment"># banks</span>
-<span id="L397" class="LineNr">397 </span>  00  <span class="subxComment"># memory_model</span>
-<span id="L398" class="LineNr">398 </span><span class="subxComment"># 31c</span>
-<span id="L399" class="LineNr">399 </span>  00  <span class="subxComment"># bank_size</span>
-<span id="L400" class="LineNr">400 </span>  00  <span class="subxComment"># image_pages</span>
-<span id="L401" class="LineNr">401 </span>  00  <span class="subxComment"># reserved</span>
-<span id="L402" class="LineNr">402 </span><span class="subxComment"># 31f</span>
-<span id="L403" class="LineNr">403 </span>  00 00  <span class="subxComment"># red_mask red_position</span>
-<span id="L404" class="LineNr">404 </span>  00 00  <span class="subxComment"># green_mask green_position</span>
-<span id="L405" class="LineNr">405 </span>  00 00  <span class="subxComment"># blue_mask blue_position</span>
-<span id="L406" class="LineNr">406 </span>  00 00  <span class="subxComment"># rsv_mask rsv_position</span>
-<span id="L407" class="LineNr">407 </span>  00  <span class="subxComment"># directcolor_attributes</span>
-<span id="L408" class="LineNr">408 </span><span class="subxComment"># 328</span>
-<span id="L409" class="LineNr">409 </span>  00 00 00 00  <span class="subxComment"># physbase &lt;== linear frame buffer</span>
-<span id="L410" class="LineNr">410 </span>
-<span id="L411" class="LineNr">411 </span><span class="subxComment"># 32c</span>
-<span id="L412" class="LineNr">412 </span><span class="subxComment"># reserved for video mode info</span>
-<span id="L413" class="LineNr">413 </span>                                    00 00 00 00
-<span id="L414" class="LineNr">414 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L415" class="LineNr">415 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L416" class="LineNr">416 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+<span id="L372" class="LineNr">372 </span>00 00 00 00 00 00 00 00
+<span id="L373" class="LineNr">373 </span>00 00 00 00 00 00 00 00
+<span id="L374" class="LineNr">374 </span>00 00 00 00 00 00 00 00
+<span id="L375" class="LineNr">375 </span><span class="subxComment"># idt_end:</span>
+<span id="L376" class="LineNr">376 </span>
+<span id="L377" class="LineNr">377 </span><span class="subxComment"># offset 300 (address 0x7f00):</span>
+<span id="L378" class="LineNr">378 </span><span class="subxComment"># video mode info:</span>
+<span id="L379" class="LineNr">379 </span>  00 00  <span class="subxComment"># attributes</span>
+<span id="L380" class="LineNr">380 </span>  00  <span class="subxComment"># winA</span>
+<span id="L381" class="LineNr">381 </span>  00  <span class="subxComment"># winB</span>
+<span id="L382" class="LineNr">382 </span><span class="subxComment"># 304</span>
+<span id="L383" class="LineNr">383 </span>  00 00  <span class="subxComment"># granularity</span>
+<span id="L384" class="LineNr">384 </span>  00 00  <span class="subxComment"># winsize</span>
+<span id="L385" class="LineNr">385 </span><span class="subxComment"># 308</span>
+<span id="L386" class="LineNr">386 </span>  00 00  <span class="subxComment"># segmentA</span>
+<span id="L387" class="LineNr">387 </span>  00 00  <span class="subxComment"># segmentB</span>
+<span id="L388" class="LineNr">388 </span><span class="subxComment"># 30c</span>
+<span id="L389" class="LineNr">389 </span>  00 00 00 00  <span class="subxComment"># realFctPtr (who knows)</span>
+<span id="L390" class="LineNr">390 </span><span class="subxComment"># 310</span>
+<span id="L391" class="LineNr">391 </span>  00 00  <span class="subxComment"># pitch</span>
+<span id="L392" class="LineNr">392 </span>  00 00  <span class="subxComment"># Xres</span>
+<span id="L393" class="LineNr">393 </span><span class="subxComment"># 314</span>
+<span id="L394" class="LineNr">394 </span>  00 00  <span class="subxComment"># Yres</span>
+<span id="L395" class="LineNr">395 </span>  00 00  <span class="subxComment"># Wchar Ychar</span>
+<span id="L396" class="LineNr">396 </span><span class="subxComment"># 318</span>
+<span id="L397" class="LineNr">397 </span>  00  <span class="subxComment"># planes</span>
+<span id="L398" class="LineNr">398 </span>  00  <span class="subxComment"># bpp</span>
+<span id="L399" class="LineNr">399 </span>  00  <span class="subxComment"># banks</span>
+<span id="L400" class="LineNr">400 </span>  00  <span class="subxComment"># memory_model</span>
+<span id="L401" class="LineNr">401 </span><span class="subxComment"># 31c</span>
+<span id="L402" class="LineNr">402 </span>  00  <span class="subxComment"># bank_size</span>
+<span id="L403" class="LineNr">403 </span>  00  <span class="subxComment"># image_pages</span>
+<span id="L404" class="LineNr">404 </span>  00  <span class="subxComment"># reserved</span>
+<span id="L405" class="LineNr">405 </span><span class="subxComment"># 31f</span>
+<span id="L406" class="LineNr">406 </span>  00 00  <span class="subxComment"># red_mask red_position</span>
+<span id="L407" class="LineNr">407 </span>  00 00  <span class="subxComment"># green_mask green_position</span>
+<span id="L408" class="LineNr">408 </span>  00 00  <span class="subxComment"># blue_mask blue_position</span>
+<span id="L409" class="LineNr">409 </span>  00 00  <span class="subxComment"># rsv_mask rsv_position</span>
+<span id="L410" class="LineNr">410 </span>  00  <span class="subxComment"># directcolor_attributes</span>
+<span id="L411" class="LineNr">411 </span><span class="subxComment"># 328</span>
+<span id="L412" class="LineNr">412 </span>  00 00 00 00  <span class="subxComment"># physbase &lt;== linear frame buffer</span>
+<span id="L413" class="LineNr">413 </span>
+<span id="L414" class="LineNr">414 </span><span class="subxComment"># 32c</span>
+<span id="L415" class="LineNr">415 </span><span class="subxComment"># reserved for video mode info</span>
+<span id="L416" class="LineNr">416 </span>                                    00 00 00 00
 <span id="L417" class="LineNr">417 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 <span id="L418" class="LineNr">418 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 <span id="L419" class="LineNr">419 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
@@ -478,167 +479,21 @@ if ('onhashchange' in window) {
 <span id="L424" class="LineNr">424 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 <span id="L425" class="LineNr">425 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 <span id="L426" class="LineNr">426 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L427" class="LineNr">427 </span>
-<span id="L428" class="LineNr">428 </span><span class="subxComment"># offset 400 (address 0x8000):</span>
-<span id="L429" class="LineNr">429 </span><span class="subxComment"># keyboard normal map:</span>
-<span id="L430" class="LineNr">430 </span>00
-<span id="L431" class="LineNr">431 </span><span class="subxComment">#  es</span>
-<span id="L432" class="LineNr">432 </span>   1b
-<span id="L433" class="LineNr">433 </span><span class="subxComment">#     |&lt;--- digits --------------&gt;| -  =  bs</span>
-<span id="L434" class="LineNr">434 </span>      31 32 33 34 35 36 37 38 39 30 2d 3d 08
-<span id="L435" class="LineNr">435 </span><span class="subxComment"># offset 40f</span>
-<span id="L436" class="LineNr">436 </span><span class="subxComment">#  tb q  w  e  r  t  y  u  i  o  p  [  ]</span>
-<span id="L437" class="LineNr">437 </span>   09 71 77 65 72 74 79 75 69 6f 70 5b 5d
-<span id="L438" class="LineNr">438 </span><span class="subxComment"># offset 41c</span>
-<span id="L439" class="LineNr">439 </span><span class="subxComment">#                                         enter</span>
-<span id="L440" class="LineNr">440 </span>                                          0a 00
-<span id="L441" class="LineNr">441 </span><span class="subxComment"># offset 41e</span>
-<span id="L442" class="LineNr">442 </span><span class="subxComment">#     a  s  d  f  g  h  j  k  l  ;  '  `     \</span>
-<span id="L443" class="LineNr">443 </span>      61 73 64 66 67 68 6a 6b 6c 3b 27 60 00 5c
-<span id="L444" class="LineNr">444 </span><span class="subxComment"># offset 42c</span>
-<span id="L445" class="LineNr">445 </span><span class="subxComment">#     z  x  c  v  b  n  m  ,  .  /</span>
-<span id="L446" class="LineNr">446 </span>      7a 78 63 76 62 6e 6d 2c 2e 2f
-<span id="L447" class="LineNr">447 </span><span class="subxComment"># offset 436</span>
-<span id="L448" class="LineNr">448 </span>                  00 00 00 00 00 00 00 00 00 00
-<span id="L449" class="LineNr">449 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L450" class="LineNr">450 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L451" class="LineNr">451 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L452" class="LineNr">452 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L453" class="LineNr">453 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L454" class="LineNr">454 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L455" class="LineNr">455 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L456" class="LineNr">456 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L457" class="LineNr">457 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L458" class="LineNr">458 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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-<span id="L460" class="LineNr">460 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L461" class="LineNr">461 </span>
-<span id="L462" class="LineNr">462 </span><span class="subxComment"># 500:</span>
-<span id="L463" class="LineNr">463 </span><span class="subxComment"># keyboard shift map:</span>
-<span id="L464" class="LineNr">464 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L465" class="LineNr">465 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L466" class="LineNr">466 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L467" class="LineNr">467 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L468" class="LineNr">468 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L469" class="LineNr">469 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L470" class="LineNr">470 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L471" class="LineNr">471 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L472" class="LineNr">472 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L473" class="LineNr">473 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L474" class="LineNr">474 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L475" class="LineNr">475 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L476" class="LineNr">476 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L477" class="LineNr">477 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L478" class="LineNr">478 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L479" class="LineNr">479 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L480" class="LineNr">480 </span>
-<span id="L481" class="LineNr">481 </span><span class="subxComment"># 600:</span>
-<span id="L482" class="LineNr">482 </span><span class="subxComment"># keyboard ctrl map:</span>
-<span id="L483" class="LineNr">483 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L484" class="LineNr">484 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L485" class="LineNr">485 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L486" class="LineNr">486 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L487" class="LineNr">487 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L488" class="LineNr">488 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L489" class="LineNr">489 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L490" class="LineNr">490 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L491" class="LineNr">491 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L492" class="LineNr">492 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L493" class="LineNr">493 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L494" class="LineNr">494 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L495" class="LineNr">495 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L496" class="LineNr">496 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L497" class="LineNr">497 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L498" class="LineNr">498 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L499" class="LineNr">499 </span>
-<span id="L500" class="LineNr">500 </span><span class="subxComment"># padding (there might be more keyboard tables)</span>
-<span id="L501" class="LineNr">501 </span><span class="subxComment"># 700:</span>
-<span id="L502" class="LineNr">502 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L503" class="LineNr">503 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L504" class="LineNr">504 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L505" class="LineNr">505 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L506" class="LineNr">506 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L507" class="LineNr">507 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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-<span id="L510" class="LineNr">510 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L511" class="LineNr">511 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L512" class="LineNr">512 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L513" class="LineNr">513 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L514" class="LineNr">514 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L515" class="LineNr">515 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L516" class="LineNr">516 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L517" class="LineNr">517 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L518" class="LineNr">518 </span>
-<span id="L519" class="LineNr">519 </span><span class="subxComment"># 800:</span>
-<span id="L520" class="LineNr">520 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L521" class="LineNr">521 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L522" class="LineNr">522 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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-<span id="L524" class="LineNr">524 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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-<span id="L531" class="LineNr">531 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L532" class="LineNr">532 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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-<span id="L534" class="LineNr">534 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L535" class="LineNr">535 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L536" class="LineNr">536 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L537" class="LineNr">537 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L538" class="LineNr">538 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L539" class="LineNr">539 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L540" class="LineNr">540 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L541" class="LineNr">541 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L542" class="LineNr">542 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L543" class="LineNr">543 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L544" class="LineNr">544 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L545" class="LineNr">545 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L546" class="LineNr">546 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L547" class="LineNr">547 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L548" class="LineNr">548 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L549" class="LineNr">549 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L550" class="LineNr">550 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L551" class="LineNr">551 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L552" class="LineNr">552 </span><span class="subxComment"># a00:</span>
-<span id="L553" class="LineNr">553 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L554" class="LineNr">554 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L555" class="LineNr">555 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L556" class="LineNr">556 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L557" class="LineNr">557 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L558" class="LineNr">558 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L559" class="LineNr">559 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L560" class="LineNr">560 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L561" class="LineNr">561 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L562" class="LineNr">562 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L563" class="LineNr">563 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L564" class="LineNr">564 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L565" class="LineNr">565 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L566" class="LineNr">566 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L567" class="LineNr">567 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L568" class="LineNr">568 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L569" class="LineNr">569 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L570" class="LineNr">570 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L571" class="LineNr">571 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L572" class="LineNr">572 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L573" class="LineNr">573 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L574" class="LineNr">574 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L575" class="LineNr">575 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L576" class="LineNr">576 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L577" class="LineNr">577 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L578" class="LineNr">578 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L579" class="LineNr">579 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L580" class="LineNr">580 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L581" class="LineNr">581 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L582" class="LineNr">582 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L583" class="LineNr">583 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L584" class="LineNr">584 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
-<span id="L585" class="LineNr">585 </span><span class="subxComment"># offset c00 (address 0x8800)</span>
-<span id="L586" class="LineNr">586 </span>
-<span id="L587" class="LineNr">587 </span><span class="subxComment"># vim&#0058;ft=subx</span>
+<span id="L427" class="LineNr">427 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+<span id="L428" class="LineNr">428 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+<span id="L429" class="LineNr">429 </span>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+<span id="L430" class="LineNr">430 </span>
+<span id="L431" class="LineNr">431 </span><span class="subxComment">## the rest of this file has data</span>
+<span id="L432" class="LineNr">432 </span>
+<span id="L433" class="LineNr">433 </span><span class="subxComment"># offset 400 (address 0x8000):</span>
+<span id="L434" class="Folded">434 </span><span class="Folded">+--158 lines: # translating keys to ASCII -----------------------------------------------------------------------------------------------------------------------------------------------</span>
+<span id="L592" class="LineNr">592 </span>
+<span id="L593" class="LineNr">593 </span><span class="subxComment"># offset c00 (address 0x8800)</span>
+<span id="L594" class="Folded">594 </span><span class="Folded">+--236 lines: # Bitmaps for some ASCII characters (soon Unicode) ------------------------------------------------------------------------------------------------------------------------</span>
+<span id="L830" class="LineNr">830 </span>
+<span id="L831" class="LineNr">831 </span><span class="subxComment"># offset 1400 (address 0x9000)</span>
+<span id="L832" class="LineNr">832 </span>
+<span id="L833" class="LineNr">833 </span><span class="subxComment"># vim&#0058;ft=subx</span>
 </pre>
 </body>
 </html>
diff --git a/html/baremetal/ex1.hex.html b/html/baremetal/ex1.hex.html
index c3d5a530..3adbfdb7 100644
--- a/html/baremetal/ex1.hex.html
+++ b/html/baremetal/ex1.hex.html
@@ -66,8 +66,8 @@ if ('onhashchange' in window) {
 <span id="L13" class="LineNr">13 </span><span class="subxComment"># Or:</span>
 <span id="L14" class="LineNr">14 </span><span class="subxComment">#   bochs -f baremetal/boot.bochsrc  # boot.bochsrc loads disk.img</span>
 <span id="L15" class="LineNr">15 </span>
-<span id="L16" class="LineNr">16 </span><span class="subxComment"># main:  (address 0x8800)</span>
-<span id="L17" class="LineNr">17 </span>e9 fb ff ff ff  <span class="subxComment"># jump to address 0x8800</span>
+<span id="L16" class="LineNr">16 </span><span class="subxComment"># main:  (address 0x9000)</span>
+<span id="L17" class="LineNr">17 </span>e9 fb ff ff ff  <span class="subxComment"># jump to main, hanging indefinitely</span>
 <span id="L18" class="LineNr">18 </span>
 <span id="L19" class="LineNr">19 </span><span class="subxComment"># vim&#0058;ft=subx</span>
 </pre>
diff --git a/html/baremetal/ex1.subx.html b/html/baremetal/ex1.subx.html
index e19160b8..dca74155 100644
--- a/html/baremetal/ex1.subx.html
+++ b/html/baremetal/ex1.subx.html
@@ -16,7 +16,7 @@ a { color:inherit; }
 * { font-size:12pt; font-size: 1em; }
 .subxComment { color: #005faf; }
 .LineNr { }
-.Constant { color: #008787; }
+.subxFunction { color: #af5f00; text-decoration: underline; }
 -->
 </style>
 
@@ -64,12 +64,10 @@ if ('onhashchange' in window) {
 <span id="L10" class="LineNr">10 </span><span class="subxComment"># Or:</span>
 <span id="L11" class="LineNr">11 </span><span class="subxComment">#   bochs -f baremetal/boot.bochsrc  # boot.bochsrc loads disk.img</span>
 <span id="L12" class="LineNr">12 </span>
-<span id="L13" class="LineNr">13 </span>== code
-<span id="L14" class="LineNr">14 </span>
-<span id="L15" class="LineNr">15 </span><span class="Constant">$loop</span>:
-<span id="L16" class="LineNr">16 </span>e9/jump $loop/disp32
-<span id="L17" class="LineNr">17 </span>
-<span id="L18" class="LineNr">18 </span><span class="subxComment"># vim&#0058;ft=subx</span>
+<span id="L13" class="LineNr">13 </span><span class="subxFunction">main</span>:
+<span id="L14" class="LineNr">14 </span>  e9/jump <a href='ex1.subx.html#L13'>main</a>/disp32
+<span id="L15" class="LineNr">15 </span>
+<span id="L16" class="LineNr">16 </span><span class="subxComment"># vim&#0058;ft=subx</span>
 </pre>
 </body>
 </html>
diff --git a/html/baremetal/ex2.hex.html b/html/baremetal/ex2.hex.html
index 312aaf96..b5c89498 100644
--- a/html/baremetal/ex2.hex.html
+++ b/html/baremetal/ex2.hex.html
@@ -66,7 +66,7 @@ if ('onhashchange' in window) {
 <span id="L13" class="LineNr">13 </span><span class="subxComment"># Expected output:</span>
 <span id="L14" class="LineNr">14 </span><span class="subxComment">#   html/baremetal.png</span>
 <span id="L15" class="LineNr">15 </span>
-<span id="L16" class="LineNr">16 </span><span class="subxComment"># main:  (address 0x8800)</span>
+<span id="L16" class="LineNr">16 </span><span class="subxComment"># main:  (address 0x9000)</span>
 <span id="L17" class="LineNr">17 </span>
 <span id="L18" class="LineNr">18 </span><span class="subxComment"># ecx &lt;- LFB</span>
 <span id="L19" class="LineNr">19 </span>8b  <span class="subxComment"># copy *rm32 to r32</span>
diff --git a/html/baremetal/ex2.mu.html b/html/baremetal/ex2.mu.html
index a078082e..4dd35a7f 100644
--- a/html/baremetal/ex2.mu.html
+++ b/html/baremetal/ex2.mu.html
@@ -66,7 +66,7 @@ if ('onhashchange' in window) {
 <span id="L8" class="LineNr"> 8 </span><span class="muComment">#   bochs -f baremetal/boot.bochsrc               # boot.bochsrc loads disk.img</span>
 <span id="L9" class="LineNr"> 9 </span><span class="muComment">#</span>
 <span id="L10" class="LineNr">10 </span><span class="muComment"># Expected output:</span>
-<span id="L11" class="LineNr">11 </span><span class="muComment">#   <a href='https://github.com/akkartik/mu/blob/main/html/baremetal.png'>html/baremetal.png</a></span>
+<span id="L11" class="LineNr">11 </span><span class="muComment">#   html/baremetal.png</span>
 <span id="L12" class="LineNr">12 </span>
 <span id="L13" class="LineNr">13 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex2.mu.html#L13'>main</a></span> <span class="Delimiter">{</span>
 <span id="L14" class="LineNr">14 </span>  <span class="PreProc">var</span> y/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
diff --git a/html/baremetal/ex2.subx.html b/html/baremetal/ex2.subx.html
index e150cc4a..3d27392c 100644
--- a/html/baremetal/ex2.subx.html
+++ b/html/baremetal/ex2.subx.html
@@ -16,6 +16,7 @@ a { color:inherit; }
 * { font-size:12pt; font-size: 1em; }
 .subxComment { color: #005faf; }
 .LineNr { }
+.subxFunction { color: #af5f00; text-decoration: underline; }
 .Constant { color: #008787; }
 -->
 </style>
@@ -64,30 +65,27 @@ if ('onhashchange' in window) {
 <span id="L10" class="LineNr">10 </span><span class="subxComment"># Expected output:</span>
 <span id="L11" class="LineNr">11 </span><span class="subxComment">#   html/baremetal.png</span>
 <span id="L12" class="LineNr">12 </span>
-<span id="L13" class="LineNr">13 </span><span class="subxComment"># main:  (address 0x8800)</span>
-<span id="L14" class="LineNr">14 </span>
-<span id="L15" class="LineNr">15 </span>== code
+<span id="L13" class="LineNr">13 </span><span class="subxFunction">main</span>:
+<span id="L14" class="LineNr">14 </span>  <span class="subxComment"># ecx &lt;- start of video memory</span>
+<span id="L15" class="LineNr">15 </span>  8b/-&gt; *0x7f28 1/r32/ecx
 <span id="L16" class="LineNr">16 </span>
-<span id="L17" class="LineNr">17 </span><span class="subxComment"># ecx &lt;- start of video memory</span>
-<span id="L18" class="LineNr">18 </span>8b/-&gt; *0x7f28 1/r32/ecx
+<span id="L17" class="LineNr">17 </span>  <span class="subxComment"># eax &lt;- final pixel of video memory</span>
+<span id="L18" class="LineNr">18 </span>  8d/copy-address *(ecx + 0x0bffff) 0/r32/eax  <span class="subxComment"># 0xbffff = 1024*768 - 1</span>
 <span id="L19" class="LineNr">19 </span>
-<span id="L20" class="LineNr">20 </span><span class="subxComment"># eax &lt;- final pixel of video memory</span>
-<span id="L21" class="LineNr">21 </span>8d/copy-address *(ecx + 0x0bffff) 0/r32/eax  <span class="subxComment"># 0xbffff = 1024*768 - 1</span>
-<span id="L22" class="LineNr">22 </span>
-<span id="L23" class="LineNr">23 </span><span class="subxComment"># for each pixel in video memory</span>
-<span id="L24" class="LineNr">24 </span>{
-<span id="L25" class="LineNr">25 </span>  39/compare %eax 1/r32/ecx
-<span id="L26" class="LineNr">26 </span>  7c/jump-if-&lt; <span class="Constant">break</span>/disp8
-<span id="L27" class="LineNr">27 </span>  <span class="subxComment"># write its column number to it</span>
-<span id="L28" class="LineNr">28 </span>  88/byte&lt;- *eax 0/r32/AL
-<span id="L29" class="LineNr">29 </span>  48/decrement-eax
-<span id="L30" class="LineNr">30 </span>  eb/jump <span class="Constant">loop</span>/disp8
-<span id="L31" class="LineNr">31 </span>}
-<span id="L32" class="LineNr">32 </span>
-<span id="L33" class="LineNr">33 </span><span class="subxComment"># hang indefinitely</span>
-<span id="L34" class="LineNr">34 </span>{
-<span id="L35" class="LineNr">35 </span>  eb/jump <span class="Constant">loop</span>/disp8
-<span id="L36" class="LineNr">36 </span>}
+<span id="L20" class="LineNr">20 </span>  <span class="subxComment"># for each pixel in video memory</span>
+<span id="L21" class="LineNr">21 </span>  {
+<span id="L22" class="LineNr">22 </span>    39/compare %eax 1/r32/ecx
+<span id="L23" class="LineNr">23 </span>    7c/jump-if-&lt; <span class="Constant">break</span>/disp8
+<span id="L24" class="LineNr">24 </span>    <span class="subxComment"># write its column number to it</span>
+<span id="L25" class="LineNr">25 </span>    88/byte&lt;- *eax 0/r32/AL
+<span id="L26" class="LineNr">26 </span>    48/decrement-eax
+<span id="L27" class="LineNr">27 </span>    eb/jump <span class="Constant">loop</span>/disp8
+<span id="L28" class="LineNr">28 </span>  }
+<span id="L29" class="LineNr">29 </span>
+<span id="L30" class="LineNr">30 </span>  <span class="subxComment"># hang indefinitely</span>
+<span id="L31" class="LineNr">31 </span>  {
+<span id="L32" class="LineNr">32 </span>    eb/jump <span class="Constant">loop</span>/disp8
+<span id="L33" class="LineNr">33 </span>  }
 </pre>
 </body>
 </html>
diff --git a/html/baremetal/ex3.hex.html b/html/baremetal/ex3.hex.html
index b39c442f..08708bd7 100644
--- a/html/baremetal/ex3.hex.html
+++ b/html/baremetal/ex3.hex.html
@@ -64,7 +64,7 @@ if ('onhashchange' in window) {
 <span id="L11" class="LineNr">11 </span><span class="subxComment"># Or:</span>
 <span id="L12" class="LineNr">12 </span><span class="subxComment">#   bochs -f baremetal/boot.bochsrc  # boot.bochsrc loads disk.img</span>
 <span id="L13" class="LineNr">13 </span>
-<span id="L14" class="LineNr">14 </span><span class="subxComment"># main:  (address 0x8800)</span>
+<span id="L14" class="LineNr">14 </span><span class="subxComment"># main:  (address 0x9000)</span>
 <span id="L15" class="LineNr">15 </span>
 <span id="L16" class="LineNr">16 </span><span class="subxComment"># eax &lt;- LFB</span>
 <span id="L17" class="LineNr">17 </span>8b  <span class="subxComment"># copy *rm32 to r32</span>
@@ -78,7 +78,7 @@ if ('onhashchange' in window) {
 <span id="L25" class="LineNr">25 </span>  <span class="subxComment"># CL = *read index</span>
 <span id="L26" class="LineNr">26 </span>  8a  <span class="subxComment"># copy m8 at r32 to r8</span>
 <span id="L27" class="LineNr">27 </span>    0d  <span class="subxComment"># 00/mod/indirect 001/r8/cl 101/rm32/use-disp32</span>
-<span id="L28" class="LineNr">28 </span>    cf 7d 00 00  <span class="subxComment"># disp32 [label]</span>
+<span id="L28" class="LineNr">28 </span>    cc 7d 00 00  <span class="subxComment"># disp32 [label]</span>
 <span id="L29" class="LineNr">29 </span>  <span class="subxComment"># CL = *(keyboard buffer + ecx)</span>
 <span id="L30" class="LineNr">30 </span>  8a  <span class="subxComment"># copy m8 at r32 to r8</span>
 <span id="L31" class="LineNr">31 </span>    89  <span class="subxComment"># 10/mod/*+disp32 001/r8/cl 001/rm32/ecx</span>
@@ -92,11 +92,11 @@ if ('onhashchange' in window) {
 <span id="L39" class="LineNr">39 </span>  <span class="subxComment"># otherwise increment read index</span>
 <span id="L40" class="LineNr">40 </span>  fe  <span class="subxComment"># increment byte</span>
 <span id="L41" class="LineNr">41 </span>    05  <span class="subxComment"># 00/mod/indirect 000/subop/increment 101/rm32/use-disp32</span>
-<span id="L42" class="LineNr">42 </span>    cf 7d 00 00  <span class="subxComment"># disp32 [label]</span>
+<span id="L42" class="LineNr">42 </span>    cc 7d 00 00  <span class="subxComment"># disp32 [label]</span>
 <span id="L43" class="LineNr">43 </span>  <span class="subxComment"># clear top nibble of index (keyboard buffer is circular)</span>
 <span id="L44" class="LineNr">44 </span>  80  <span class="subxComment"># and byte</span>
 <span id="L45" class="LineNr">45 </span>    25  <span class="subxComment"># 00/mod/indirect 100/subop/and 101/rm32/use-disp32</span>
-<span id="L46" class="LineNr">46 </span>    cf 7d 00 00  <span class="subxComment"># disp32 [label]</span>
+<span id="L46" class="LineNr">46 </span>    cc 7d 00 00  <span class="subxComment"># disp32 [label]</span>
 <span id="L47" class="LineNr">47 </span>    0f  <span class="subxComment"># imm8</span>
 <span id="L48" class="LineNr">48 </span>  <span class="subxComment"># print a pixel in fluorescent green</span>
 <span id="L49" class="LineNr">49 </span>  c6  <span class="subxComment"># copy imm8 to m8 at rm32</span>
diff --git a/html/baremetal/ex3.mu.html b/html/baremetal/ex3.mu.html
new file mode 100644
index 00000000..c9d6fb1f
--- /dev/null
+++ b/html/baremetal/ex3.mu.html
@@ -0,0 +1,93 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/ex3.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.muComment { color: #005faf; }
+.LineNr { }
+.SpecialChar { color: #d70000; }
+.Delimiter { color: #c000c0; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
+.PreProc { color: #c000c0; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/ex3.mu'>https://github.com/akkartik/mu/blob/main/baremetal/ex3.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Draw pixels in response to keyboard events, starting from the top-left</span>
+<span id="L2" class="LineNr"> 2 </span><span class="muComment"># and in raster order.</span>
+<span id="L3" class="LineNr"> 3 </span><span class="muComment">#</span>
+<span id="L4" class="LineNr"> 4 </span><span class="muComment"># To build a disk image:</span>
+<span id="L5" class="LineNr"> 5 </span><span class="muComment">#   ./translate_mu_baremetal baremetal/ex3.mu     # emits disk.img</span>
+<span id="L6" class="LineNr"> 6 </span><span class="muComment"># To run:</span>
+<span id="L7" class="LineNr"> 7 </span><span class="muComment">#   qemu-system-i386 disk.img</span>
+<span id="L8" class="LineNr"> 8 </span><span class="muComment"># Or:</span>
+<span id="L9" class="LineNr"> 9 </span><span class="muComment">#   bochs -f baremetal/boot.bochsrc               # boot.bochsrc loads disk.img</span>
+<span id="L10" class="LineNr">10 </span><span class="muComment">#</span>
+<span id="L11" class="LineNr">11 </span><span class="muComment"># Expected output: a new green pixel starting from the top left corner of the</span>
+<span id="L12" class="LineNr">12 </span><span class="muComment"># screen every time you press a key (letter or digit)</span>
+<span id="L13" class="LineNr">13 </span>
+<span id="L14" class="LineNr">14 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex3.mu.html#L14'>main</a></span> <span class="Delimiter">{</span>
+<span id="L15" class="LineNr">15 </span>  <span class="PreProc">var</span> x/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L16" class="LineNr">16 </span>  <span class="PreProc">var</span> y/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L17" class="LineNr">17 </span>  <span class="Delimiter">{</span>
+<span id="L18" class="LineNr">18 </span>    <span class="PreProc">var</span> key/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='102keyboard.subx.html#L3'>read-key</a> <span class="Constant">0</span>  <span class="muComment"># real keyboard</span>
+<span id="L19" class="LineNr">19 </span>    compare key, <span class="Constant">0</span>
+<span id="L20" class="LineNr">20 </span>    <span class="PreProc">loop-if-=</span>  <span class="muComment"># busy wait</span>
+<span id="L21" class="LineNr">21 </span>    <a href='101screen.subx.html#L3'>pixel</a> <span class="Constant">0</span>, x, y, <span class="Constant">0x31</span>  <span class="muComment"># green</span>
+<span id="L22" class="LineNr">22 </span>    x <span class="SpecialChar">&lt;-</span> increment
+<span id="L23" class="LineNr">23 </span>    compare x, <span class="Constant">0x400</span>
+<span id="L24" class="LineNr">24 </span>    <span class="Delimiter">{</span>
+<span id="L25" class="LineNr">25 </span>      <span class="PreProc">break-if-&lt;</span>
+<span id="L26" class="LineNr">26 </span>      y <span class="SpecialChar">&lt;-</span> increment
+<span id="L27" class="LineNr">27 </span>      x <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L28" class="LineNr">28 </span>    <span class="Delimiter">}</span>
+<span id="L29" class="LineNr">29 </span>    <span class="PreProc">loop</span>
+<span id="L30" class="LineNr">30 </span>  <span class="Delimiter">}</span>
+<span id="L31" class="LineNr">31 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/ex4.mu.html b/html/baremetal/ex4.mu.html
new file mode 100644
index 00000000..b9c5a36f
--- /dev/null
+++ b/html/baremetal/ex4.mu.html
@@ -0,0 +1,77 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/ex4.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.muComment { color: #005faf; }
+.LineNr { }
+.SpecialChar { color: #d70000; }
+.Delimiter { color: #c000c0; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
+.PreProc { color: #c000c0; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/ex4.mu'>https://github.com/akkartik/mu/blob/main/baremetal/ex4.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Draw a character using the built-in font (GNU unifont)</span>
+<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
+<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To build a disk image:</span>
+<span id="L4" class="LineNr"> 4 </span><span class="muComment">#   ./translate_mu_baremetal baremetal/ex4.mu     # emits disk.img</span>
+<span id="L5" class="LineNr"> 5 </span><span class="muComment"># To run:</span>
+<span id="L6" class="LineNr"> 6 </span><span class="muComment">#   qemu-system-i386 disk.img</span>
+<span id="L7" class="LineNr"> 7 </span><span class="muComment"># Or:</span>
+<span id="L8" class="LineNr"> 8 </span><span class="muComment">#   bochs -f baremetal/boot.bochsrc               # boot.bochsrc loads disk.img</span>
+<span id="L9" class="LineNr"> 9 </span><span class="muComment">#</span>
+<span id="L10" class="LineNr">10 </span><span class="muComment"># Expected output: letter 'A' in green near the top-left corner of screen</span>
+<span id="L11" class="LineNr">11 </span>
+<span id="L12" class="LineNr">12 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex4.mu.html#L12'>main</a></span> <span class="Delimiter">{</span>
+<span id="L13" class="LineNr">13 </span>  <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x41</span>  <span class="muComment"># 'A'</span>
+<span id="L14" class="LineNr">14 </span>  <a href='103grapheme.subx.html#L1'>draw-grapheme</a> <span class="Constant">0</span>, g, <span class="Constant">0x10</span>, <span class="Constant">0x10</span>, <span class="Constant">0xa</span>
+<span id="L15" class="LineNr">15 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/baremetal/ex5.mu.html b/html/baremetal/ex5.mu.html
new file mode 100644
index 00000000..a83a2e12
--- /dev/null
+++ b/html/baremetal/ex5.mu.html
@@ -0,0 +1,75 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/ex5.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.muComment { color: #005faf; }
+.LineNr { }
+.Delimiter { color: #c000c0; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
+.PreProc { color: #c000c0; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/ex5.mu'>https://github.com/akkartik/mu/blob/main/baremetal/ex5.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Draw an ASCII string using the built-in font (GNU unifont)</span>
+<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
+<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To build a disk image:</span>
+<span id="L4" class="LineNr"> 4 </span><span class="muComment">#   ./translate_mu_baremetal baremetal/ex5.mu     # emits disk.img</span>
+<span id="L5" class="LineNr"> 5 </span><span class="muComment"># To run:</span>
+<span id="L6" class="LineNr"> 6 </span><span class="muComment">#   qemu-system-i386 disk.img</span>
+<span id="L7" class="LineNr"> 7 </span><span class="muComment"># Or:</span>
+<span id="L8" class="LineNr"> 8 </span><span class="muComment">#   bochs -f baremetal/boot.bochsrc               # boot.bochsrc loads disk.img</span>
+<span id="L9" class="LineNr"> 9 </span><span class="muComment">#</span>
+<span id="L10" class="LineNr">10 </span><span class="muComment"># Expected output: text in green near the top-left corner of screen</span>
+<span id="L11" class="LineNr">11 </span>
+<span id="L12" class="LineNr">12 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex5.mu.html#L12'>main</a></span> <span class="Delimiter">{</span>
+<span id="L13" class="LineNr">13 </span>  <a href='501draw-text-rightward.mu.html#L1'>draw-text-rightward</a> <span class="Constant">0</span>, <span class="Constant">&quot;hello from baremetal Mu!&quot;</span>, <span class="Constant">0x10</span>, <span class="Constant">0x10</span>, <span class="Constant">0xa</span>
+<span id="L14" class="LineNr">14 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->