From what I understand the problem is that the graphics chip produces an NTSC video signal directly, without a separate encoder you could grab an intermediate RGB signal from. The NES rgb mods either use an FPGA implementation of the PPU, the arcade NES PPU that produces RGB already, or operate in parallel to grab some register writes. In short, it is very specific to the NES.
So the best option is an external S-Video to RGB conversion. Edit: Reading back this thread it looks like you could grab digital Y and UV values you could convert back to RGB. There would be some loss, but it would be better than converting the analogue values. This really needs someone with the skills to sit down and implement this into a small FPGA or CPLD, or maybe even a RP2040.
FM-Towns II has RGB already on the monitor output: https://gamesx.com/wiki/doku.php?id=av:japanese_rgb-15
So the best option is an external S-Video to RGB conversion. Edit: Reading back this thread it looks like you could grab digital Y and UV values you could convert back to RGB. There would be some loss, but it would be better than converting the analogue values. This really needs someone with the skills to sit down and implement this into a small FPGA or CPLD, or maybe even a RP2040.
FM-Towns II has RGB already on the monitor output: https://gamesx.com/wiki/doku.php?id=av:japanese_rgb-15
Last edited:
