: MAME ROM sets are version-specific. As the emulator evolves to be more accurate, the expected file structure and data for ROMs change. A set designed for version 0.34 will often not work with current versions of MAME (like 0.264+) without being updated. Vintage Use Cases

. Instead, the "hot" set was filled with prototype versions of games that never hit the floor of an 80s arcade. The Prototype: One file, labeled simply 'SOLAR_WIND_P1'

Stay retro.