Well I found mine in a strange place, I was looking for a website where I could download music and stuff for my PSP, I found this forum site called pspiso, it has a lot of emulators and games for things like NES, SNES N64 and gameboy, they work you just got to figure them out first
http://www.pspiso.com/showthread.php?t=104467 bare in mind youve got to make an account first, hope you can work the things better than I can.