Do unzip the ROM files. MAME expects ZIP files with a specific internal CRC structure.
A ROM that worked on MAME version 0.139 might not work on version 0.250. Mame Roms Pack For Android
Remember: Emulation preserves history. Support the original developers when re-releases appear on modern platforms. Do unzip the ROM files
Unlike console emulators that use a single file for a game, MAME requires a specific "set" of files that mirror the original arcade circuit board. These files are often bundled into ROM packs, which come in three primary formats: which come in three primary formats: