Just about everything I have tried works okay with my Dell S2716DG 1440p monitor, except the arcade PCB of Raiden II. It will display the game for 1 second, cut out for 5 seconds, come back for 1 second, repeat on and on. Yesterday while messing around, I got it to work consistently if I unplugged and plugged the HDMI cable in, but unfortunately I forgot to write down the settings I had.
The OSSC reports the input at 285p, 15.97kHz, and 56.05Hz, and the monitor reports the Line2x as 720×480@61Hz. If I keep adjusting the horizontal backporch length, the picture stays stable and perfect, but then goes out when I stop. Neither the OSSC or my XCapture-1 lose sync, only the monitor itself does.
Yeah it’s pretty far off. Only reason I am bothering to keep trying is because it has worked a few times, for several hours at that. When I accidently got it working yesterday, it was stable for the 2 hours I played, with no hiccups whatsoever. Just need to coax the monitor into not cutting out.