Solution: This often indicates a mismatch between the BIOS version and the game region. For Japanese region ST-V games, you may need sp5001-a.bin from a Japanese BIOS dump. Try finding a complete ST-V BIOS set with multiple revisions.
Based on MAME’s internal ROM sets, sp5001-a.bin appears in drivers for: Sp5001-a.bin Mame
In MAME source (src/mame/drivers/segasy18.cpp or segasy16.cpp), sp5001-a.bin often serves as a main CPU program ROM (usually for the 68000 or Z80). Solution: This often indicates a mismatch between the
The sp5001-a.bin file is physically located on the MVS motherboard within a specific socket (often designated for the System BIOS). In MAME source ( src/mame/drivers/segasy18