At least in my case, I have other practical reasons for it, like doing a bit more than just arcade from my control panel. There's always TurboGrafx-16, SNES, Genesis, NES, and so forth-- those extra two buttons beyond a 3x2 get quite a bit of use.
Hell, don't even get me started on PlayChoice-10.
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Try checking the MAME manual at http://docs.mamedev.org
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