Most games don't bother, so it really doesn't matter what the checksum in the header says. Also, since the Genesis doesn't checksum the cart, it is up to the code in the cart to checksum itself. Therefore, we find quite a few games with "bad" checksums that are actually correct (we prefer to call them "misunderstood checksums" rather than doing the non-politically correct thing by labeling them "bad"). Although Sega recommended the use of a simple "add up all the bytes in the cart" checksum routine, and most games did this and put the correct value in their header, Sega did not require this. The Genesis does not have a checksum routine built into its BIOS. Not necessarily, although why is a long explanation. Does a bad checksum mean there is something wrong with my cartridge?
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