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Is there a unique identifier to a game pak?


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Lets say I was using a piece of hardware like retrode to emulate a game straight off of the cartridge. Does anyone know if there is a way to tell two copies of the same game apart? or possibly is there a unique identifier on the PCB itself? I know there is a serial country code but I don't know if there is any unique identifier. asking because I'm wondering if there is a way to ensure if a rom came from a specific game pak.

any ideas?