Reply To: SNES Diagonal Lines

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#27462
Harrumph
Participant

Looks like you may have an APU-01 board revision, which has severe composite video subcarrier interference on RGB lines. You can fix it by lifting pin 3 on PPU-2, as documented by FBX (and originally Voultar).
https://shmups.system11.org/viewtopic.php?f=6&t=43689&p=1312908&hilit=snes+apu+subcarrier#p1312908