Download the official , which acts as the database blueprint.
| Check | Tool | What to expect | |-------|------|----------------| | CRC match | 7-Zip or ClrMAMEPro | All files show green (pass) | | No fake/empty ROMs | ROMVault | 0 missing, 0 unneeded | | CHD integrity (if included) | MAME -verifyroms | No "rom/CHD not found" errors | mame 0139u1 roms download repack verified