For the PSP itself, games were distributed on Universal Media Discs (UMDs). When a user "dumps" a game from a UMD to a computer, it creates a file, usually with an .iso extension. A compressed version is known as a .cso . In the strictest definition, these are technically ISOs, but the community colloquially refers to them as ROMs.
Don't forget native PSP ROMs:
: A compressed ISO format that saves space but may cause slight stuttering or longer load times on original hardware.
A full-scale GTA experience on a handheld.
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A "complete" PSP library typically features these top-rated games known for pushing the handheld's limits: God of War: Chains of Olympus Ghost of Sparta
PlayStation Portable (PSP) "ROMs"—more accurately referred to as or CSO files—are digital copies of physical UMD (Universal Media Disc) games designed for Sony's first handheld console. Today, these files are primarily used with emulators to play classic titles on modern devices like PCs, smartphones, and handheld gaming consoles. PSP ROMs: Soaring High & Staying Secure - Ftp