Searching for "GameShark 50 PSX ISO" today leads you down a rabbit hole of dead GeoCities links, cryptic Reddit threads, and .7z files on obscure ROM sites. Why? Because it was never an official product. It was a fan-made, cracked, and patched-together tool distributed on IRC and Usenet.
For the , hunting down a GameShark 50 ISO is an exercise in historical recreation, not necessity. Modern emulators do a better job. However, if you are building a "Complete Retro PSX Collection" on a Raspberry Pi or a MiSTer FPGA, having the original bootable cheat disc adds a layer of authenticity. gameshark 50 psx iso