This is what it says in the FAQ for running it in MAME
IT WON'T RUN IN MAME...
As of right now it will only run in MAME with the debug option on. Until it's recognized as a legitimate revision it won't pass the checksum it's expecting to see since it's modified from the original 3.1L. Once the project is complete I will submit a request for it to be included in the Database. Just add the option -debug MK2 to MAME to execute and don't forget F5 to start it once the debugger is shown.