The deciphered logic from inside the GAL 16V8 shows that its purpose was to handle whether the cartridge delivered the game rom or the Gameshark rom to the N64 depending on what address was being read ...
To enter cheat codes, follow these steps: Open up the VBA emulator > Select File > Open > Choose the Pokémon Fire Red ROM > Select Cheats Click on Cheat list from the VBA menu > Select Gameshark > ...