Emulators?

I want to know which emulators I can use and works the beast with my slim cfw 3.90 M33-3. I already have a SNES and NES that works well, now I want a playstation, GBA, GB and I don't know which one to use.

also i want to know if I can play psp roms on my psp and if so how?

Yup! Cuz we all luv to work the "beast" in our PSPs

PM me your email address, I'll Email you a RoxPak with roms+The emu you need.
Feel free to ask me for a few roms(All SR like )

also i have another question, what are ISOs and how do I use them.

ISOs are the files of a game. Just stick them in the 'ISO' folder on the base of your memory stick.

i would recommend using a cso file instead... the file is smaller and it seems to run better... at least for me