I know what you're talking about. That's the MESEN emulator. It's supposed to be cycle accurate which means it's likely too processor intensive to run on the pi. There is a libretro port for it, but it doesnt seem to appear in the retropie selections. Maybe look in the experimental cores.

Thank you for the information. Now I am a bit wiser.

Bump, adding /opt/retropie/configs/all/retroarch.cfg file to the first post ... I don't see anything wrong with it. Yet neither controller or keyboard work with lr-cores. EDIT : managed to get back controls on lr-cores by deleting /opt/retropie/configs/all/retroarch-joypads , disabling , enabling xboxdrv, remapping the controllers and lots of reboot On another note, no progress on getting enhanced resolution and analog support with pcsx-rearmed :/