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

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#12205

marqs
Participant

Nes PPU skips a tick every other frame just before first visible scanline is drawn, resulting to non-periodic hsync which is bad reference for any digitizer. An universal fix would be to alter Nes clocking circuitry (e.g. via CPLD/MCU) so that one oscillation cycle on the uneven scanline is gated, thus stabilizing hsync period.