Thanks for info guys.
Sorry when I said fullscreen I didn’t mean 16:9 stretched, I have it OK in 4:3 aspect ratio.
Non-integer scaling of console stuff didn’t look good to me on a 1080p TV, from previous endeavors, but now on my 4K OLED, non-integer scaling (done by the TV) looks very acceptable, I’m guessing because the extra resolution of 4K is allowing things to look more even. I haven’t explained that very well but I know what I mean. >_<
Just completed SNES Street Fighter II Turbo via the OSSC.. quite the milestone (on my non-1chip SNES). 🙂