Reply To: OSSC v1.xx series beta firmware

[marqs]

I recently debugged one RGB-capable Atari 7800 + STe RGB cable combo which had sync issues with a number of modern devices. The problem was sync level being excessive for 75ohm termination due to the cable missing resistor on sync line. According to this page pin 2 is used either for CVBS or TTL sync output depending on model and revision. This reminds me of similar stupidity Nintendo has with multi-av where certain pin is csync or 12V, latter is both cases unsuitable (and potentially dangerous) to be connected to 75ohm terminated video input.

Not sure if it’s the same issue here, but I’d check details of GD cartridge (if used instead of standard RGB out) to make sure it’s compatible with the cable used.