First you need custom firmware on your PSP, i use 3.71-3 M33.
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Then you go to
http://www.psp-hacks.com and download the emulator you want, they have loads for nintendo,sega,classic consoles.
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Simple as that really, you can then play all your backed up games from your memory card.
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Works with PSP,PS1,SNES,NES,GB,GBA,SEGA Saturn/master system/game gear etc.
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