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MAME (an acronym of Multiple Arcade Machine Emulator) is an emulator application 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".[2]

The first public MAME release (0.1) was on February 5, 1997, by Nicola Salmoria. The emulator now supports over seven thousand unique games and ten thousand actual ROM image sets, though not all of the supported games are playable. The project is currently maintained by MESS project leader, Miodrag Milanovic.

The original program code and graphics and sound data need to be present so that the game can be emulated. In most arcade machines, the data is stored in read-only memory chips (ROMs), although other devices such as cassette tapes, floppy disks, hard disks, laserdiscs, and compact discs are also used. The contents of most of these devices can be copied to computer files, in a process called "dumping". The resulting files are often generically called ROM images or ROMs regardless of the kind of storage they came from. A game usually consists of multiple ROM and PAL images; these are collectively stored inside a single ZIP file, constituting a ROM set. In addition to the "parent" ROM set (usually chosen as the most recent "World" version of the game), games may have "clone" ROM sets with different program code, different language text intended for different markets etc. For example, Street Fighter II Turbo is considered a variant of Street Fighter II Champion Edition. System boards like the Neo Geo that have ROMs shared between multiple games require the ROMs to be stored in "BIOS" ROM sets and named appropriately.

Individual ROM files are often named after labels found on the ROM chips and the position they are located on the board in the format "label.position". Sega for example use a standard labeling scheme for all the ROMs found on their arcade boards giving each unique ROM chip a unique label. "mpr12380.b2" is a ROM from the Golden Axe romset. This implies that the ROM was labeled "mpr12380" and located in position "b2" on the PCB. By using such a naming scheme it makes it easy to use MAME to identify, and often help repair, non-working PCBs.

Hard disks, CDs and laserdiscs are stored in a MAME-specific but documented format called the CHD (Compressed Hunks of Data).[11] Some arcade machines use analog hardware, such as laserdiscs, to store and play back audio/video data such as soundtracks and cinematics. This data must be captured and encoded into digital files that can be read by MAME. Although MAME supports lossless compression of laserdisc data, it can be argued that the digital copy is not a perfect reproduction of the analog source.

A number of games use sound chips that have not yet been emulated successfully. These games require sound samples in WAV file format for sound emulation.

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