Before it was a digital file or a string of text on a website, the GameShark was a physical cartridge—a chunk of gray plastic that fit into the Parallel I/O port on the back of the original "fat" PlayStation models. Released by Interact (and later Datel under the name Action Replay), it was a third-party cheat device that allowed users to alter the data of a game before it loaded.
If you were looking for a (the boot disc that came with some versions of GameShark): gameshark ps1 rom
Cheating is fun, but use it wisely. Always try to beat a game legitimately once before you turn on "Infinite Health." The GameShark was a tool to extend the life of a game, not to ruin the journey. Before it was a digital file or a