12 Facts About DOS


DOS is a platform-independent acronym for "disk operating system" that later became a common shorthand for disk-based operating systems on IBM PC compatibles.

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MS-DOS dominated the IBM PC compatible market between 1981 and 1995.

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Gordon Letwin wrote in 1995 that "DOS was, when we first wrote it, a one-time throw-away product intended to keep IBM happy so that they'd buy our languages".

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FreeDOS project began on 26 June 1994, when Microsoft announced it would no longer sell or support MS-DOS.

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ROM-DOS is used as operating system for the Canon PowerShot Pro 70.

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Machine-dependent versions of MS-DOS were produced for many non-IBM-compatible x86-based machines, with variations from relabelling of the Microsoft distribution under the manufacturer's name, to versions specifically designed to work with non-IBM-PC-compatible hardware.

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DOS is a single-user, single-tasking operating system with basic kernel functions that are non-reentrant: only one program at a time can use them, and DOS itself has no functionality to allow more than one program to execute at a time.

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Lastly, DOS allocates letters for optical disc drives, RAM disks, and other hardware.

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DOS 5+ allowed the use of available upper memory blocks via the DOS=UMB statement in CONFIG.

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The DOS booted this way has full access to the system, but provides its own drivers for hardware.

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DOS systems include utility programs and provide internal commands that don't correspond to programs.

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DOS did however provide a Terminate and Stay Resident function which allowed programs to remain resident in memory.

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