Reply To: US N64 rgb modded tims board and ossc sync

[Harrumph]

N64 outputs 263 lines, so there is something up with the sync. I couldn’t tell you if it’s something with your install, but you could try adjusting the coast and/or vertical sync slice value.
http://junkerhq.net/xrgb/index.php?title=OSSC#Sync_opt.