IBM PC DOS

IBM PC DOS (full name: The IBM Personal Computer Disk Operating System) is a DOS system for the IBM Personal Computer and compatibles, manufactured and sold by IBM from the 1980s to the 2000s. From its inception until 1993, PC DOS was a rebranded version of Microsoft MS-DOS.

Read more about IBM PC DOS:  History

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    Talk is a pure art. Its only limits are the patience of listeners who, when they get tired, can always pay for their coffee or change it with a friendly waiter and walk out.
    —John Dos Passos (1896–1970)