Reply To: OSSC PRO settings for Atari 1040STe

[Retro-Computer-Shack]

After speaking to Matt (and thanks again for you help). here is the problem.

I design make and sell and support video leads for Micro computers, and sell them worldwide.

My Atari ST and STe RGB Scart leads, work perfectly with the OSSC v1.6 and v1.7 using v0.90a firmware (but not with 1.x). They work perfectly with the RetroScaler GBSC Pro, with default settings, and work perfectly with the RetroTINK 5x with a few quick changes to the default settings. https://youtu.be/Ti_jpO9dKLo

They won’t work with properly with v1.8 OSSC with v0.90 firmware, get a stable picture most of the time, but intermittently get a blank “no signal” picture, and won’t work at all with v1.12 firmware, sync frequency reading on display go mad, changing all the time, occasionally displaying a picture for a second or so, but most of time nothing.

My Scart lead used Composite video for sync on pin 20 of the Scart connected via a 150R resistor, which together with the 75R input impedance (voltage divider) gives a voltage of about 800mV Peak, as measured with a scope.

Blanking signal is provided by the VSYNC signal from the ST connected directly to pin 16 on the Scart. RGB lines are connected with 150R resistors. I appreciate not many people will be using the OSSC with an Atari ST, but it would be nice to get working again, with an OSSC v1.8 with latest firmware.

Regards,
Ian Priddey (Retro Computer Shack).