@roslof Hope you got it working! Apologies, I have been busy and not visiting the forum.

@dankcushions Yes I think that is what it looks like. But it's much easier to see in motion. It's not related to the resolution (I tried several).

Report the issue here: https://github.com/libretro/snes9x2010

Ok, I tried turning off dithering, and it didn't seem to make any difference. I'm still getting artifacts, like echo-type sounds, sounds that go on longer than they should etc. I have listened carefully to games that I am very familiar with on other systems, and this definitely only seems to affect Hatari.