sets are the easiest to use because every ZIP file contains all the data needed to run that specific game without needing a "parent" file. Mame 0.78 romset roms
Arcade games often had multiple versions. For example, Street Fighter II had a World version, a USA version, a Japanese version, and later "Turbo" editions.
as an emulator, the legal status of ROMs remains a complex grey area of copyright. Most official developers recommend using freely available ROMs
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