Strictly speaking, a ROM is a read-only memory file—a digital rip of a cartridge or disc. Since the GameShark was a disc-based cheat loader , a "GameShark PS2 ROM" likely refers to one of three things:
Navigation is handled via a simple menu list. You select your game from a database, select the cheats you want, and tell the system to "Start Game." It is intuitive, but by modern UI standards, it is clunky, slow, and visually dated. Gameshark Ps2 Rom
Before the era of in-game microtransactions and "pay-to-win" mechanics, players used physical cheat devices. The (manufactured by InterAct, later Mad Catz) was a disc-based solution for the PS2. To use it, you would: Strictly speaking, a ROM is a read-only memory