If you download a folder labeled "MAME 0.139 ROMs," what exactly are you getting? It is crucial to understand the file structure.
A ROM set, or ROM collection, is a set of files that contain the data from the original arcade game's ROM chips. These files are essential to run the games on an emulator like MAME. Each ROM set is specific to a particular version of MAME, and using a ROM set with a different MAME version may result in compatibility issues or non-working games. mame 0.139 romset
You need a (sometimes called "0.139 ROMs"). It is a matched set – ROMs from any other MAME version (0.138, 0.140, 0.155, etc.) will have mismatched checksums and will not work or will show missing files. If you download a folder labeled "MAME 0