Mame | 0.139 Romset ((link))

file, MAME romsets must match the emulator version exactly. As hardware documentation improves, the "correct" way to dump a game's ROM changes, causing old files to fail modern checks. Because 0.139 was such a popular baseline for early mobile ports, the 0.139 romset became widely distributed online, creating a self-perpetuating cycle: people use it because it's available, and it's available because so many people use it. MAME ROMS Explained - Pandoras Toy Box

I recall that 0.139 was one of the last sets where CHDs for games like Killer Instinct and Cruis’n USA were relatively small compared to the 10GB+ monsters they became later. Does anyone have a list of which CHDs are required for this version? mame 0.139 romset

: Non-merged – you can copy any single game ZIP and it just works. file, MAME romsets must match the emulator version exactly