Still plenty more of those on other Irem M72 world region pcbs yet to be dealt with.
* comments from file src/mame/drivers/m72.cpp *
// in the case of the i8751 protected games the World and Japan sets should be using different MCU roms. // the MCU roms provide checksum information needed for the sets, so using the wrong ROM will result in // the program roms failing their tests. This is why we still have simulation code for many games // despite having Japanese version MCU roms for several of them.
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