I recently updated the input code for mame2010. It now supports four players and standard retroarch input remapping. These features may not have made their way to the recalbox version yet, but they will the next time the core is updated on this side.
Best posts made by markwkidd
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RE: Mame 2010 recalbox 18.02.09
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RE: Probleme mit Romset MAME 0.78
Pardon my response in English.
With a Full Non-Merged MAME 0.78 collection, like the most recent MAME 2003 Reference Set, the BIOS ROM files are inside the game ZIP. It works the same this way -- no separate BIOS needed.