Hacking Save Data - Checksum

[andwhyisit]

I remember being being told once that the save data most likely has a checksum to check if the information in the save file isn't corrupted.

Does anyone know what checksum information looks like and how it is generated?

[IIMarckus(imported)]

Many different types of checksums exist. For instance, all Game Boy carts require a checksum in the cartridge header, offset 0x14D, which is checked when the Game Boy is turned on. Generally a checksum is just one or two bytes generated by a simple algorithm such as adding all the bytes together (though it is certainly possible to use stronger algorithms for tasks that need it).