This is a collection of ROMs from the history of MAME that have been replaced, modified or removed from the MAME sets. (ROMs are occasionally re-dumped or changed to reflect out-of-date methods, or from once-non-functional sets.) It allows older versions of MAME to be run against ROMs that worked at the time.
MAME (an acronym of Multiple Arcade Machine Emulator) is a free and open source emulator designed to recreate the hardware of arcade game systems in software on modern personal computers and other platforms. The intention is to preserve gaming history by preventing vintage games from being lost or forgotten. The aim of MAME is to be a reference to the inner workings of the emulated arcade machines; the ability to actually play the games is considered "a nice side effect". Joystiq has listed MAME as an application that every gamer should have.