I played SNES games emulated on a 66MHz 486/DX2 using an emulator named "esnes". No sound[1] and translucency was more miss than hit, but good enough to play through the entirety of ChronoTrigger. It was pretty cool to play a current (if aging) system emulated on a PC.
1: Sound was eventually implemented, I don't remember if it was before or after I upgraded to a Pentium though.