List of disk operating systems

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This is a list of disk operating systems in which the acronym DOS is used to form their names.

x86 DOS systems[edit]

These operating systems, which run on x86 microprocessors, most commonly are used on IBM PC-compatibles.

  • 86-DOS (aka. QDOS, created 1980), an operating system developed by Seattle Computer Products for its 8086-based S-100 computer kit, heavily inspired by CP/M
  • MS-DOS (since 1981), a Microsoft operating system based on 86-DOS for x86-based personal computers
  • PC DOS (aka IBM DOS) (since 1981), an OEM version of MS-DOS for the IBM Personal Computer and compatibles, manufactured and sold by IBM from the 1980s to the 2000s
  • Concurrent DOS (aka CDOS, Concurrent PC DOS and CPCDOS) (since 1983), a PC DOS and CP/M-86 compatible multiuser multitasking operating system, based on Concurrent CP/M-86 developed by Digital Research
  • FlexOS, a modular distributed real-time multitasking operating system with optional DOS emulation based on Concurrent DOS 286 by Digital Research
  • 4680 OS, an IBM operating system based on FlexOS 286 by Digital Research
  • 4690 OS, an IBM operating system based on FlexOS 386 by Digital Research
  • Multiuser DOS (aka MDOS), a PC DOS and CP/M-86 compatible multiuser multitasking operating system based on Concurrent DOS by Digital Research
  • System Manager, a successor of Multiuser DOS by Datapac Australasia
  • REAL/32, a real-time successor of Multiuser DOS by Intelligent Micro Software
  • DOS Plus (since 1985), a PC DOS and CP/M-86 compatible multitasking operating system for early x86-based personal computers, based on Concurrent PC DOS 4.1/5.0 by Digital Research
  • DR-DOS (aka DR DOS) (since 1988), a PC DOS-compatible operating system for IBM PC-compatible personal computers, originally developed by Digital Research and derived from Concurrent PC DOS 6.0
  • NetWare PalmDOS, a successor of DR DOS 6.0 specifically tailored for early mobile and palmtop PCs by Novell
  • Novell DOS, a multitasking successor of DR DOS 6.0 by Novell
  • OpenDOS, a successor of Novell DOS by Caldera
  • PTS-DOS (since 1993), a disk operating system, a DOS clone, developed in Russia by PhysTechSoft
  • FreeDOS (since 1998), an operating system for IBM PC compatible computers
  • ROM-DOS, an MS-DOS clone by Datalight

Other operating systems[edit]

(in alphabetical order by name)

See also[edit]