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In most arcade machines, the data (consisting of the game program, graphics, sounds, etc.) is stored in read-only memory chips (hence the name "ROM"), although other devices such as cassettes,floppy disks, hard disks, laserdiscs, and compact discs are also used. 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.
To play a particular game, MAME requires a set of files called a ROM set. They contain all the data from the original machine; for legal reasons, however, MAME itself does not include any of these files
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