• A family of disk-based operating systems for IBM PC and compatible computers. The DOS family primarily consists of IBM PC DOS and a rebranded version, Microsoft’s MS-DOS, both of which were introduced in 1981. Later compatible systems from other manufacturers are DR-DOS (1988), ROM-DOS (1989), PTS-DOS (1993), and FreeDOS (1994). MS-DOS dominated the IBM PC market between 1981 and 1995. ← Wikipedia

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