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

NewHome › Forums › OSSC & OSSC Pro › OSSC – Discussion and support › Issues with RGB modded NES (Famicom AV) on new FW › Reply To: Issues with RGB modded NES (Famicom AV) on new FW

April 4, 2017 at 7:17 PM #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.