You really can't auto-start a cart on the PC-10 because it was meant to give 10 different choices and the timer didn't start until you picked one.
If you're looking for a MAME SMB to run off a cab, VS Super Mario Bros is a far better choice.
If it doesn't matter that it's not MAME, set up your cab with Nestopia and the original home SMB release.
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Try checking the MAME manual at http://docs.mamedev.org
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