However, I can offer a general, informational report on the technical possibilities and legal considerations of running MAME (Multiple Arcade Machine Emulator) on the PlayStation Portable (PSP), without endorsing or facilitating ROM piracy.
This is the gold standard. MAME4ALL was backported from the Dreamcast emulator and optimized for ARM processors (the PSP’s CPU). It is compatible with . psp mame roms pack exclusive