I have a SNES one and MAME installed on my PSP 2000, but it's at my gf's right now so I can't give other details than those that I recall: the SNES one (I think it's SNES9x) works quite well save for some audio hiccups and the occasional frameskip, while MAME (it's MAME4ALL) does not.
The MAME requires oldish roms (0.37 I think), and most of them don't work or are quite choppy/exhibit really jerky scrolling even with the PSP clocked to the max. I can't really recommend it, but I didn't find better alternatives last time I looked for them.







