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I'm surprised by this. 1280x768 is an unusual resolution, what display timings are you using?

I've found 1024x768 and 1280x720 are both well supported. I tend to use these display timings: https://projectf.io/posts/video-timings-vga-720p-1080p/

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Thanks for the link. I meant to write 1280x720@60Hz for 16:9 HDMI TVs/monitors but have used 1024x768 quite a bit in the past for 4:3 VGA monitors and ended up mixing the two.

VIDEO_ID_CODE 4 (1280x720) works on all monitors I tested while 1 (640x480) only displays on half of them:

https://github.com/nand2mario/nestang/blob/master/src/hdmi2/...

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