Most people have the standard set. But this IC2? It’s a or a patched sprite decoder that was never meant for the public. Someone at a repair bench in Osaka in 1998 probably burned this chip, fixed a glitch on one cabinet, and then… the file sat on a forgotten hard drive for 25 years.
You can typically find this file in full MAME ROM sets (e.g., version 0.252 or later). Epr-18022.ic2 Mame Download