You're looking for information on MAME 0.250 ROMs.
Therefore, a proper “0.250 set” includes: Mame 0.250 Roms
When curating your MAME 0.250 collection, ensure you have the that matches version 0.250. Using a BIOS from 0.200 will likely result in checksum errors. You're looking for information on MAME 0