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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<title>Mu - apps/ex3.mu</title>
+<meta name="Generator" content="Vim/8.2">
+<meta name="plugin-version" content="vim8.1_v2">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback">
+<meta name="colorscheme" content="minimal-light">
+<style>
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #ffffd7; }
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+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.PreProc { color: #c000c0; }
+.muRegEcx { color: #870000; }
+.muRegEdx { color: #af5f00; }
+.LineNr { }
+.Constant { color: #008787; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.Delimiter { color: #c000c0; }
+.muComment { color: #005faf; }
+.Special { color: #ff6060; }
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+
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+  return true;
+}
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+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/apps/ex3.mu'>https://github.com/akkartik/mu/blob/main/apps/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 apps/ex3.mu        # emits code.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 code.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 bochsrc               # bochsrc loads code.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> <a href='../500fake-screen.mu.html#L14'>screen</a>: (addr <a href='../500fake-screen.mu.html#L14'>screen</a>), keyboard: (addr keyboard), data-disk: (addr disk) <span class="Delimiter">{</span>
+<span id="L15" class="LineNr">15 </span>  <span class="PreProc">var</span> x/<span class="muRegEcx">ecx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L16" class="LineNr">16 </span>  <span class="PreProc">var</span> y/<span class="muRegEdx">edx</span>: int <span class="Special">&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/eax: byte <span class="Special">&lt;-</span> <a href='../102keyboard.subx.html#L21'>read-key</a> keyboard
+<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#L8'>pixel-on-real-screen</a> x, y, <span class="Constant">0x31</span>/green
+<span id="L22" class="LineNr">22 </span>    x <span class="Special">&lt;-</span> increment
+<span id="L23" class="LineNr">23 </span>    compare x, <span class="Constant">0x400</span>/screen-width=<span class="Constant">1024</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="Special">&lt;-</span> increment
+<span id="L27" class="LineNr">27 </span>      x <span class="Special">&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 : -->