Yeah, don't bother. Performance is abysmal. If you REALLY want to go down that road, wait for the ODroid C2 to get hardware accelerated video on Linux.
Or, go with the C2's Android support and get MAME compiled for Android if you're feeling adventurous.
The C2 has twice the RAM and CPU of a Pi 3 for $5 more.
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Try checking the MAME manual at http://docs.mamedev.org
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