|
DevelopmentSega Master System / Mark III / Game Gear |
Home - Forums - Games - Scans - Maps - Cheats - Credits |
The game has an internal checksum routine:
It sums all the 8-bit bytes from offset $4000 to $7ffff - so the first 16KB is not checked. The expected sum is stored at offset $0000f. The first byte of the checksum routine is a "nop", seemingly for ease of patching to remove the check by writing a "ret" opcode.