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Reply To: Issues with RGB modded NES (Famicom AV) on new FW

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#13752

marqs
Participant

There are some details/hints on previous page such as disabling “Allow TVP HPLL2x” or trying 256×240 optimized mode. However, a proper solution would be to modify NES itself as I wrote earlier. Assuming PPU uses flip-flop clock divider instead of PLL (for 21.477272MHz / 4), there’s a good chance a solution would be as simple as gating four master clock cycles on PPU input during the short scanline to normalize its length (in time domain). To my knowledge there are no timing glitches when NES is used with PlayChoice PPU (which does not have the short scanline) so there should not be any compatibility issues with the mod, but I’ll need to try it for real at some point to verify that.