Emulators on PSP

>GBA 

gpSPmod (20090720) or gpSP-J (20120616)  

>GB and GBC 

RIN 1.32  

>NES and Famicom Disc System 

NesterJ 1.13 beta2 or NesterJ AoEX  

>SNES 

Snes9x Euphoria R5 Beta3 NoME 0.2 

SNES emulation is not that good to begin with, but this is the fastest and most compatible.  

>Genesis and Sega CD 

PicoDrive 1.51b  

>Master System and Game Gear 

MasterBoy 2.10  

>PCE and PCECD 

HuE 0.70  

>NEOGEO Pocket 

RACE! 2.16-1.0 

>Wonderswan and Wonderswan Color 

[e]mulator v082f  

>ARCADE 

UOcps1psp (CPS1), UOcps2psp (CPS2), UOmvspsp (NeoGeo), UOncdzpsp (NeoGeo CD)  

>What about PS1 games? 

You have 3 options: 

download them from Sony servers: http://www.pspiso.com/psp-games/1066688-community-psn-thread-share.html 

convert isos to eboot using PSX2PSP: http://downloads.exophase.com/198/psx2psp-v142/ 

download pre-converted games: Devils-Shadow, PSPISO, etc.