MAME (Multiple Arcade Machine Emulator) is a long-running project whose purpose is to preserve the software and behavior of arcade machines by emulating their hardware in software. Each MAME release is typically accompanied by a snapshot of supported drivers and a matching set of ROMs (read-only memory images) needed to run the emulated games. The version number 0.139u1 denotes a specific snapshot in the MAME project’s development history: version 0.139 plus one update (u1). Discussing “MAME 0.139u1 ROMs list” therefore touches on several interrelated topics: what a ROMs list is and why it matters, how MAME versions map to ROM sets, practical implications for users and preservationists, and the legal and logistical considerations around collecting and using ROMs for an old MAME build.