I can explain how it used to work when GameSharks were still a thing. And this was how it worked with both my gameboy and my Nintendo 64. You see, those cheat codes were really just hexadecimal values for different quantities in the game like health or ammo. The gameshark had a hacking mode where you could put in a value such as how many bullets you had left and it would return every hex value with that quantity. Do this a couple times and it’s able to narrow it down to the right hex value, which was a memory address for that particular ammo counter. Then you had yourself a cheat code that would keep the ammo value constant that the GameShark could use.
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