Introduction: NES GBA and PSX Games on Your IPhone or ITouch
Yes !
Already jailbreaked your apple?
if so then load the Emulators from Installer and run them.
(If not then see my instructables for hacking 1.1.2 and 1.1.1 iPhone/iTouches)
If you can install the emulators then just add the following Sources to installer and ...viola!
The Roms can be installed and run in a few minutes!
Just Watch!
Step 1: PSX
PSX Emulator
Step 2: GBA
GameBoy emulator
Step 3: NES
NES Emulator