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83 lines
4.0 KiB
HTML
83 lines
4.0 KiB
HTML
<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
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<style>
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:root {
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html { font-size: 16px; background: var(--bg); }
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
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font-size: 16px;
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code span.kw { color: #cf222e; }
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code span.op { color: #cf222e; }
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<body>
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<div class="sourceCode" id="cb1"><pre class="sourceCode fsharp"><code class="sourceCode fsharp"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="kw">let</span> stepper <span class="op">()</span> =</span>
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<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a> //<span class="co"> Execute a single instruction</span></span>
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<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a> //<span class="co"> Each instruction uses a different amount of cycles</span></span>
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<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a> <span class="kw">let</span> mCycles = stepCpu cpu io</span>
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<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a> </span>
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<span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a> <span class="kw">for</span> _ <span class="kw">in</span> <span class="fl">1.</span>.mCycles <span class="kw">do</span> </span>
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<span id="cb1-7"><a href="#cb1-7" aria-hidden="true" tabindex="-1"></a> stepTimers timer io </span>
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<span id="cb1-8"><a href="#cb1-8" aria-hidden="true" tabindex="-1"></a> stepSerial serial io</span>
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<span id="cb1-9"><a href="#cb1-9" aria-hidden="true" tabindex="-1"></a> //<span class="co"> The APU technically runs at 4x CPU-cycles, but can be batched</span></span>
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<span id="cb1-10"><a href="#cb1-10" aria-hidden="true" tabindex="-1"></a> stepApu apu </span>
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<span id="cb1-11"><a href="#cb1-11" aria-hidden="true" tabindex="-1"></a> </span>
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<span id="cb1-12"><a href="#cb1-12" aria-hidden="true" tabindex="-1"></a> <span class="kw">let</span> tCycles = mCycles * <span class="dv">4</span> </span>
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<span id="cb1-13"><a href="#cb1-13" aria-hidden="true" tabindex="-1"></a> </span>
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<span id="cb1-14"><a href="#cb1-14" aria-hidden="true" tabindex="-1"></a> //<span class="co"> The PPU operates at 4x CPU-cycles. The APU should be here too</span></span>
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<span id="cb1-15"><a href="#cb1-15" aria-hidden="true" tabindex="-1"></a> <span class="kw">for</span> _ <span class="kw">in</span> <span class="fl">1.</span>.tCycles <span class="kw">do</span> </span>
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<span id="cb1-16"><a href="#cb1-16" aria-hidden="true" tabindex="-1"></a> stepPpu ppu </span>
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<span id="cb1-17"><a href="#cb1-17" aria-hidden="true" tabindex="-1"></a> </span>
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<span id="cb1-18"><a href="#cb1-18" aria-hidden="true" tabindex="-1"></a> //<span class="co"> Return cycles taken so the frontend runs the emulator at the right speed</span></span>
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<span id="cb1-19"><a href="#cb1-19" aria-hidden="true" tabindex="-1"></a> mCycles </span></code></pre></div>
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</body></html>
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