#2 a wavey line rolling down the screen every 80 frames (or so) when something is scrolling vertically. I assume it’s a sync issue, no matter what I try, I can’t get rid of it.
I think this is caused by the off spec refresh of a PAL PS1, PAL Megadrives are bad for it as well.
It doesn’t seem to happen on X2 only higher multiples.
I now use a switch modded NTSC Megadrive when I have to use 50hz as it actually closer to 50hz than a PAL console. It still skips a frame every few seconds when scolling vertically but you don’t get the wavy line.