Manually checking thousands of zip files for missing or corrupted chips is impossible. To ensure your collection perfectly matches the MAME 0.250 database, use a ROM management tool:
If you are running the MAME 0.250 executable (or the RetroArch MAME 0.250 core), ensure your ROMs are strictly sourced from a 0.250 reference set. Using a 0.270 or 0.220 ROM set will result in missing file errors. Mame 0.250 Roms
Having the ROMs is half the battle. To actually play them with the correct version: Manually checking thousands of zip files for missing
MAME does not change ROM requirements to frustrate users. Changes happen because of the project's commitment to accuracy: Having the ROMs is half the battle
Key highlights of this release include:
: Every game ZIP contains every file it needs to run, including redundant parent data. This is the most storage-intensive option but allows you to move individual ZIPs without worrying about dependencies. Key Components for Full Functionality
How To Get CHD Games WORKING in Newer Versions MAME! | Tutorial