MAME ROMs change often. It is possible that ROMs are getting dumped/redumped or renamed. The best thing you can do is download ClrMame, read the tutorial here and rebuild your old ROMs in a new directory. In this way you will get the correct sets for the latest MAME. You will miss a lot files, since the complete MAME set is around 12GB (excluding the CHDs, which are another >35GB).
Good luck![]()


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