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History
PTS-DOS
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PTS-DOS is a disk operating system, a DOS clone, developed in Russia by PhysTechSoft and Paragon Technology Systems.
Paragon Technology Systems PTS/DOS 6.51CD & S/DOS 1.0
Paragon Technology Systems PTS/DOS 6.51CD & S/DOS 1.0
DOS
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DOS is a family of disk-based operating systems for IBM PC 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 include DR-DOS (1988), ROM-DOS (1989), PTS-DOS (1993), and FreeDOS (1998). MS-DOS dominated the IBM PC compatible market between 1981 and 1995.
The IBM Personal Computer (IBM 5150 PC)
The IBM Personal Computer (IBM 5150 PC)