RetroArch is a modular application platform capable of emulating multiple systems created by the development team Libretro. In its version for PSP, RetroArch can emulate the following systems: Game Boy, Game Boy Color, Game Boy Advance, Nintendo (NES), MSX-1, MSX-2, PC Engine / TurboGrafx 16, NXEngine and PrBoom . Future versions may this magnificent new application systems are added.

http://psp.scenebeta.com/noticia/retroarch-psp