List of disk operating systems

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

x86 DOS systems

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

(in alphabetical order by name)

See also

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