Maintaining a MAME 0.139u1 ROMs archive is primarily about fidelity to that release’s datfile and careful documentation of included BIOS/CHD/sample dependencies. Use verification tools, keep integrity records, and follow legal guidelines when assembling or sharing archives.
Since the set is "frozen" in time, you won't deal with the "broken ROM" errors common when mixing different version sets. Broad Library: Mame 0.139u1 Roms Archive
Even a perfect 0.139u1 archive can have problems due to operating system changes. Maintaining a MAME 0