I have finished conversion of "cheat_manager" and "group_entry" classes but I grapple with the thorny issues of "cheat_entry" (as one of individual class or merged to "group_entry" class). So I convert Bygone to 0.140 and search a memory then create "complete" No-hit Invincibility...
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"Any company has no power to stop people emulating"
MAME is the emulator of no giving in the pressure from any company even if they don't allow