We're lucky all these people work on MAME so do loads of research on the system, get schematics on the system, buy a system & donate it to the MAME devs. You might just get some devs interested in seeing how the system works so they can try to write code for it & then & only then you'll get the answer to your question.
For now you'll have to wait patiently like the rest of us are doing & enjoy the long list of working games to choose from.
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