OSSC frequently loses sync for Uzebox video Mode 3 games with a lot of sound or music

[danboid]

The Uzebox is an open source 8 bit games console based on an AVR ATMega644.

The Uzebox Omega is a SCART mod and easier to build one chip version of the Uzebox.

https://uzebox.org/wiki/Omega

I've built a few and I can run games like Donkey Kong fine:

https://uzebox.org/wiki/Donkey_Kong

and IKD:

https://uzebox.org/forums/viewtopic.php?p=33065#p33065

I can run these fine on the Uzebox Omega both through my Samsung RGB SCART TV and everything is also fine when I run it through my LiNKFOR SCART to HDMI converter, but when I try running these games or any other video mode 3 games on my Uzebox Omega v1.1.1 through my OSSC, I get frequent drop outs of the audio and video every few seconds, often multiple times a minute. I have tried several video output settings and options but non of them work for this situation.

I'm using a McBazel 1.7 OSSC that's been upgraded to marqs OSSC firmware 1.12., which I think is the current stable release.

When I have my Omega connected to my OSSC, the LCD says:

AV1_RGBS 262-p

15.73Khz 60.04Hz

Approx every 5 to 30 seconds, the green LED to the right of the LED panel turns off and the video and audio drop out for a second before the LED comes back on along with the audio and video.

This console works fine with my RGB SCART TVs as well as three other SCART to HDMI converters I’ve tried it with but I'd like it to fully work with the OSSC if, we can find some settings that are Mode 3 + audio friendly.

I can use the Uzebox gameloader/bootloader and a few other games that use less common video mode 74 and they run fine on the OSSC, with sound.

I would appreciate any tips anyone might have to try and get more stable signal when tryig to play vm3 Uzebox games via with the OSSC.

Thanks very much for any advice anyone can offer!