To understand SP5001ABIN, you must understand the hardware it was born from. Most evidence points to this file being related to a transition period between the Sega Saturn and the Model 3 arcade board.
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MAME has various versions and forks, and sometimes, specific ROMs or patches are developed for these variants. "sp5001abin" might be a modification or addition specifically for one of these. sp5001abin mame exclusive
The is believed to be the Japanese prototype dump. For years, only screenshots from a 1997 issue of Game Machine magazine existed. Then, in late 2022, a former Sega AM2 engineer anonymously donated a set of EPROMs to the MAME project, which became the source of this exclusive. To understand SP5001ABIN, you must understand the hardware