: You can use the command mame -verifyroms in a command line to identify which specific sets in your collection are "bad" or missing files.

In the world of MAME, a is a digital copy of the software once stored on the physical chips of an arcade machine. Version 0.144 is a "main" release, preceded by incremental "u" (update) versions like 0.143u9. David Haywood's Homepage | MAME work and other stuff

(Multi Emulator Super System) project to expand support beyond traditional arcade cabinets to include home consoles and computers. mamedev.emulab.it Key ROM Set Characteristics