Could anyone tell me where to get a NES or SNES or even a playstation 1 emulator for the PSP. I have seen people who are playing Super Mario games on their PSP and I want to know how they can do it. I have also seen somebody playing the old final fantasy series (for the ps 1) on the psp also. I would very much like to try it out.

Please give me a link containing detailed instructions in emulating for the PSP.