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Model3.cpp: Comment describing scan line timing.
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@ -2045,7 +2045,16 @@ void CModel3::RunMainBoardFrame(void)
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{
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UINT32 start = CThread::GetTicks();
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// Compute display timings
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/*
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* Compute display timings. Refresh rate is 57.524160 Hz and we assume frame timing is the same as System 24:
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*
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* - 25 scanlines from /VSYNC high to /BLANK high (top border)
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* - 384 scanlines from /BLANK high to /BLANK low (active display)
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* - 11 scanlines from /BLANK low to /VSYNC low (bottom border)
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* - 4 scanlines from /VSYNC low to /VSYNC high (vertical sync. pulse)
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*
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* 424 lines total: 384 display and 40 blanking/vsync.
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*/
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unsigned ppcCycles = m_config["PowerPCFrequency"].ValueAs<unsigned>() * 1000000;
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unsigned frameCycles = (unsigned)((float)ppcCycles / 57.524160f);
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unsigned lineCycles = frameCycles / 424;
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