The routine that determines if the cartridge (game) is from the correct region is different in every game. However, all Genesis/MD ROMS have the region(s) in plain ASCII text at this address: $0001F0. It looks like some games use that address ($0001F0) to determine the region, and some games don't. On the games that don't, you have to find the part of the ROM that checks the region, and that's not always easy to find. In these cases, a disassembler is your friend.
Tony.
Tony.
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