Many arcade and console titles cannot function independently. They rely on proprietary system BIOS files to boot. If you attempt to launch a game that requires one without having it present, MAME will return an error message or fail to load entirely.
, which were based on the classic Egg/Mickey Mouse Game & Watch programs. Input System Improvements mame 0238 bios pack top
to verify if your BIOS files are complete and correctly named for 0.238. Many arcade and console titles cannot function independently