Your best bet is to engage with the MAME community on Reddit (r/MAME) or the Arcade Projects forum. Ask for the "verified ROM checksum" for epr18022ic2, not for the file itself. Once you have the correct SHA-1 hash, finding the proper, legal dump becomes a mission of digital archaeology.
epr-18022.ic2 is a critical component of the Sega Billboard (segabill) epr18022ic2 mame download exclusive
. Technical details, including the board layout and IC2 location, are documented by the MAME repository Radiant silvergun won't load with mame-current and 250 rom Your best bet is to engage with the