In MAME emulation, is critical. Unlike most emulators, MAME ROMs must precisely match the version of the emulator being used. The 0.139 set (often labeled as MAME 2010 ) became a "goldilocks" version for the following reasons:
Why is this specific set indexed so heavily in search engines? Because the MAME project changed its ROM naming conventions drastically after 0.140. -FULL- Roms MAME 0.139 Full Arcade Set Roms
The term "FULL" can mean different things in ROM sets. A complete set of 0.139 includes every game that was considered "dumpable" and functional at that time. This includes: In MAME emulation, is critical
Use a file manager like ZArchiver to move games to Android/data/com.seleuco.mame4droid/files/roms . Because the MAME project changed its ROM naming
— Check that you're using the correct 0.139 set. ROMs from 0.200 or 0.250 will not work correctly. The emulator and ROM set version must match.
Versions of MAME released after 0.139 began demanding significantly higher processing power. Modern MAME focuses on high-accuracy simulation, which requires brute-force CPU speed. For users running arcade cabinets powered by older PCs or single-board computers (like the Raspberry Pi 3 or older), MAME 0.139 offers the perfect balance: it is accurate enough to look and feel authentic, but optimized enough to run smoothly on modest hardware.
Often labeled as the "MAME 0.139 Reference Set," it includes the BIOS files and samples necessary for certain games to produce sound. Installation Tips MAME - RetroPie Docs