The question should be what emulators are not working. Emulation for the most part on the gp32 is pretty impresive. Most of the older systems like nes, c64, atari st, pc engine and that sort of thing are pretty spot on. The 16 bit emulators such as snes and genesis are sort of pushing the gp32 to it's limits. Many of these emulators are slow and not perfectly emulated but are really making great progress and have potential to be near perfect in the future. Look around and you'll find videos of the new genesis emulator running sonic 1 with sound it's pretty impresive stuff for such a small system.