List of disk operating systems called DOS

MS-DOS / IBM PC DOS compatible systems

• MS-DOS, Microsoft operating system based on 86-DOS for x86-based personal computers
• IBM PC DOS, OEM version of MS-DOS for the IBM Personal Computer and compatibles, manufactured and sold by IBM from the 1980s to the 2000s
• DR-DOS, MS-DOS-compatible operating system originally developed by Digital Research
• ROM-DOS, MS-DOS clone by Datalight
• PTS-DOS, MS-DOS clone developed in Russia by PhysTechSoft
• FreeDOS, open source MS-DOS clone

  Other x86 disk operating systems

• 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
• 86-DOS, an operating system developed by Seattle Computer Products for its 8086-based S-100 computer kit, heavily inspired by CP/M
• Concurrent DOS , a CP/M-86 and MS-DOS 2.11 compatible multiuser, multitasking DOS, based on Concurrent CP/M-86 developed by Digital Research
• Datapac System Manager, a successor of Multiuser DOS by Datapac Australasia
• DOS Plus, 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
• FlexOS, a modular distributed real-time multitasking operating based on Concurrent DOS 286 by Digital Research
• Multiuser DOS, a PC DOS and CP/M-86 compatible multiuser multitasking operating system based on Concurrent DOS by Digital Research
• 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
• REAL/32, a real-time successor of Multiuser DOS by Intelligent Micro Software

  Disk operating systems for other platforms

• AmigaDOS, the disk operating system portion of AmigaOS
• AMSDOS, for Amstrad CPC compatibles
• ANDOS, operating system for the Russian Electronika BK computers
• Apple DOS, operating system for the Apple II series from late 1978 through early 1983
• Apple ProDOS, name for both ProDOS 8 for the Apple II and ProDOS 16 for the Apple IIGS
• Atari DOS, for the Atari 8-bit family of home computers
• Commodore DOS, for Commodore's 8-bit computers
• Cromemco DOS, a CP/M-like operating system
• CSI-DOS, for the Soviet Elektronika BK computers
• DOS, a small OS for 16-bit Data General Nova computers, a cut-down version of their RDOS.
• DEC BATCH-11/DOS-11, the first operating system to run on the PDP-11 minicomputer
• Delta DOS, third party option from Premier Microsystems for the Dragon 32/64
• DIP DOS, the operating system of the Atari Portfolio
• DOS/360, 1966 IBM System/360 mainframe computer Disk Operating System
• DOS XL, Atari 8-bit family DOS from Optimized Systems Software
• DragonDOS, for the Dragon 32/64
• GEMDOS, one of the components of the Atari TOS
• IS-DOS, for Russian ZX Spectrum clones, developed in 1990 or 1991
• MasterDOS, replacement DOS for the SAM Coupé
• MDOS, Myarc Disk Operating System for the Geneve 9640
• MSX-DOS, a cross between MS-DOS 1.0 and CP/M developed by Microsoft for the MSX computer standard
• MyDOS, third-party Atari 8-bit family DOS
• NewDos/80, Apparat's feature-rich alternative to TRSDOS for the TRS-80.
• Oric DOS, for the Oric-1 home computer
• PTDOS, for the 1970s Sol-20 from Processor Technology
• SAMDOS, original DOS for the SAM Coupé
• Sinclair QDOS, for the Sinclair QL
• RDOS, a real-time operating system released in 1972 for the Data General Nova and Eclipse minicomputers
• SK*DOS, for Motorola 68000-based systems
• SmartDOS, third-party Atari 8-bit family DOS
• SpartaDOS, third-party Atari 8-bit family DOS
• TOP-DOS, third-party Atari 8-bit family DOS
• TR-DOS, for the ZX Spectrum
• TRSDOS, for the Tandy TRS-80 line of 8-bit Zilog Z80 microcomputers
• Xtal DOS for the Tatung Einstein