You must use the MAME 0.139 emulator with the 0.139 ROM set. Using a newer emulator (e.g., 0.250) with 0.139 ROMs, or vice versa, will result in games not loading.
If you have downloaded a directory labeled and it doesn't work, here is why: -FULL- Roms MAME 0.139 Full Arcade Set Roms
— Check that you're using the correct 0.139 set. ROMs from 0.200 or 0.250 will not work correctly. The emulator and ROM set version must match. You must use the MAME 0
Small zip files containing the basic code (typically 20GB to 40GB total for version 0.139). ROMs from 0
Command line MAME is harsh. For a 0.139 set, pair it with:
Arcade ROMs occupy a complex legal gray area. Because the original code is intellectual property still owned by various holding companies, downloading full sets of copyrighted games violates copyright law in many jurisdictions.