Before diving into downloads and codes, we must distinguish between two very different concepts that often get conflated.

So, a "GameShark PS1 ROM" does not exist as a single file. Instead, it refers to two workflows:

If you own a real PS1 console and a physical GameShark disc, but you want to play a PS1 ROM from a CD-R (burned disc), you will need a "mod chip" or the "Swap Trick." The GameShark disc acts as the boot loader. Insert the GameShark, select your codes, then swap in the burned PS1 ROM disc when prompted. This is called "memory bypassing" and is a fragile but nostalgic process.

For PS1 ROM cheating, emulator-native cheat engines are superior to standalone GameShark ISOs. The latter are historically interesting but obsolete for gameplay purposes. Use DuckStation + gamehacking.org codes — safe, simple, and effective.

Some websites offer .bin files that are "pre-patched" with GameShark codes permanently burned into the game logic. While convenient, these files are:

Recommendation: Never download a pre-patched ROM. Always use the emulator’s cheat engine.

This is a gray area that every retro gamer must understand.