GameShark 2.1 (Nintendo 64)

The Nintendo 64 Gameshark featured an in-game code search menu. Versions 3.1, 3.2 & 3.3 had a parallel port on the back, allowing the device to be connected to a PC with a program called SharkLink. This was intended primarily to make entering large amounts of codes easier, but was also used for advanced hacking. The in-game code search required that an Expansion Pak be installed and that the game did not actively use the Pak for memory.