Many arcade manufacturers created standardized motherboard systems to run multiple games. The BIOS (Basic Input/Output System) is the core software that initializes this hardware.
Launch MAME, select "Audit All" (or F5 to refresh) to ensure MAME recognizes the new system files. Troubleshooting Missing BIOS Errors mame bios roms 0 147
Standard arcade games (parent ROMs) contain the code for a specific game, like Neo Geo's Metal Slug . However, they do not contain the instructions required to run the Neo Geo hardware itself. The SNK Neo Geo BIOS
Used for PolyGame Master titles like Knights of Valour . mame bios roms 0 147
The SNK Neo Geo BIOS. Required for legendary titles like King of Fighters , Metal Slug , and Samurai Shodown .
Most users searching for "mame bios roms 0 147" are looking for pre-packaged sets from archive sites. I strongly encourage you to check the MAME DEV website for redistributable BIOS files and to ensure you only keep ROMs for games you physically own.