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<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"><-</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"><-</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"><-</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"><-</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-<</span>
<span id="L26" class="LineNr">26 </span> y <span class="Special"><-</span> increment
<span id="L27" class="LineNr">27 </span> x <span class="Special"><-</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>
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