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    Senior Member gore's Avatar
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    Oct 2002

    List of known Operating Systems

    I'm kind of surprised I haven't thought about adding something like this to this forum before. I found this today, and I'm not positive it's complete, though I'm pretty sure everyone who comes through here, can always check if they know of one not listed and add it in.

    Nihil; If you happen to pop in, your particular experience should benefit this considering you were around for a lot more of this than a lot of people were.


    Acorn Computers
    RISC iX

    Amiga Inc.
    AmigaOS 1.0-3.9 (Motorola 68000)
    AmigaOS 4 (PowerPC)
    Amiga Unix (aka Amix)

    Apollo Computer

    Domain/OS : One of the first network-based systems. Run on Apollo/Domain hardware. Later bought by Hewlett-Packard.

    Apple Inc.

    For Apple II
    Apple DOS
    UCSD Pascal

    For Apple III
    SOS (Sophisticated Operating System)

    For Apple Lisa
    Lisa OS

    For Apple Newton
    Newton OS

    Classic Mac OS
    System Software 1
    System Software 2
    System Software 3
    System Software 4
    System Software 5
    System 6
    System 7
    For 68k CPUs
    System 7 (codenamed "Big Bang")
    For Intel 386 CPUs
    "Star Trek" (System 7.1 running on DR DOS "StarTrek", a Novell DOS 7 precursor)
    Mac OS 8
    Mac OS 9

    Unix-like operating systems
    For Macintosh Computers
    For 68k CPUs
    For PowerPC CPUs
    Mac OS X v10.0 (aka "Cheetah")
    Mac OS X v10.1 (aka "Puma")
    Mac OS X v10.2 (aka "Jaguar")
    Mac OS X v10.3 (aka "Panther")
    For PowerPC and Intel CPUs
    Mac OS X
    Mac OS X v10.4 (aka "Tiger")
    Mac OS X v10.5 (aka "Leopard")
    For Intel CPUs
    Mac OS X
    Mac OS X v10.6 (aka "Snow Leopard")
    Mac OS X v10.7 (aka "Lion")
    Mac OS X v10.8 (aka "Mountain Lion") (From this point on it will no long be called "Mac OS X" it will be called "OS X")
    Mac OS X Server
    For iPhone/iPod Touch/iPad/Apple TV

    Atari DOS (for 8-bit computers)
    Atari TOS
    Atari MultiTOS

    BAE Systems

    Be Inc.
    BeOS r5.1d0
    magnussoft ZETA (based on BeOS r5.1d0 source code, developed by yellowTAB)

    Bell Labs
    Unics ("Ken's new system," for its creator (Ken Thompson), officially Unics and then Unix, the prototypic operating system created in Bell Labs in 1969 that formed the basis for the Unix family of operating systems)
    UNIX Time-Sharing System v1
    UNIX Time-Sharing System v2
    UNIX Time-Sharing System v3
    UNIX Time-Sharing System v4
    UNIX Time-Sharing System v5
    UNIX Time-Sharing System v6
    CB Unix
    UNIX Time-Sharing System v7 (It is from Version 7 Unix (and, to an extent, its descendants listed below) that almost all Unix-based and Unix-like operating systems descend.)
    Unix System III
    Unix System IV
    Unix System V
    Unix System V Releases 2.0, 3.0, 3.2, 4.0, and 4.2
    UNIX Time-Sharing System v8
    UNIX TIme-Sharing System v9
    UNIX Time-Sharing System v10

    Non-Unix Operating Systems:
    Plan 9 from Bell Labs
    plan 8 from bell labs

    Bull SAS

    Burroughs Corporation
    Burroughs MCP

    Control Data Corporation
    Chippewa Operating System (COS)
    SIPROS (for Simultaneous Processing Operating System)
    SCOPE (Supervisory Control Of Program Execution)
    MACE (Mansfield and Cahlander Executive)
    Kronos (Kronographic OS)
    NOS (Network Operating System)
    NOS/BE NOS Batch Environment
    EP/IX (Enhanced Performance Unix)

    Convergent Technologies
    Convergent Technologies Operating System (later acquired by Unisys)

    Data General
    RDOS Real-time Disk Operating System, with variants: RTOS and DOS (not related to IBM PC DOS).
    AOS for 16-bit Data General Eclipse computers and AOS/VS for 32-bit (MV series) Eclipses, MP/AOS for microNOVA-based computers

    CTOS Z-80 based, Cassette Tape Operating System for early desktop systems. Capable of up to 8 simultaneous users. Replaced by DataPoint DOS.
    DOS Intel 808x/80x86-based, Disk Operating Systems for desktop systems. Capable of up to 32 users per node. Supported a sophisticated network of nodes that were often purpose-built. The name DOS was used in these products login screens before it was popularized by IBM, Microsoft and others.

    DDC-I, Inc.
    Deos Time & Space Partitioned RTOS, Certified to DO-178B, Level A since 1998
    HeartOS Posix-based Hard Real-Time Operating System

    Digital Research, Inc.
    CP/M CP/M for Intel 8080/8085 and Zilog Z80
    Personal CP/M, a refinement of CP/M 2.2 with BDOS 2.8
    CP/M Plus with BDOS 3.0
    CP/M-68K CP/M for Motorola 68000
    CP/M-8000 CP/M for Zilog Z8000
    CP/M-86 CP/M for Intel 8088/8086
    CP/M-86 Plus
    Personal CP/M-86
    MP/M Multi-user version of CP/M-80
    MP/M II
    MP/M-86 Multi-user version of CP/M-86
    MP/M 8-16, a dual-processor variant of MP/M for 8086 and 8080 CPUs.
    Concurrent CP/M, the successor of CP/M-80 and MP/M-80
    Concurrent CP/M-86, the successor of CP/M-86 and MP/M-86
    Concurrent CP/M 8-16, a dual-processor variant of Concurrent CP/M for 8086 and 8080 CPUs.
    Concurrent CP/M-68K, a variant for the 68000
    Concurrent DOS, the successor of Concurrent CP/M-86 with PC-MODE
    Concurrent PC DOS, a Concurrent DOS variant for IBM compatible PCs
    Concurrent DOS 8-16, a dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs.
    Concurrent DOS 286
    Concurrent DOS XM, a real-mode variant of Concurrent DOS with EEMS support
    Concurrent DOS 386
    Concurrent DOS 386/MGE, a Concurrent DOS 386 variant with advanced graphics terminal capabilities
    Concurrent DOS 68K, a port of Concurrent DOS to Motorola 68000 CPUs with DOS source code portability capabilities
    FlexOS 1.0 - 2.34, a derivative of Concurrent DOS 286
    FlexOS 186, a variant of FlexOS for terminals
    FlexOS 286, a variant of FlexOS for hosts
    Siemens S5-DOS/MT, an industrial control system based on FlexOS
    IBM 4680 OS, a POS operating system based on FlexOS
    IBM 4690 OS, a POS operating system based on FlexOS
    FlexOS 386, a later variant of FlexOS for hosts
    IBM 4690 OS, a POS operating system based on FlexOS
    FlexOS 68K, a derivative of Concurrent DOS 68K
    Multiuser DOS, the successor of Concurrent DOS 386
    CCI Multiuser DOS
    Datapac Multiuser DOS
    Datapac System Manager, a derivative of Datapac Multiuser DOS
    IMS Multiuser DOS
    IMS REAL/32, a derivative of Multiuser DOS
    IMS REAL/NG, the successor of REAL/32
    DOS Plus 1.2 - 2.1, a single-user, multi-tasking system derived from Concurrent DOS 4.1 - 5.0
    DR DOS 3.31 - 6.0, a single-user, single-tasking native DOS derived from Concurrent DOS 6.0
    Novell PalmDOS 1.0
    Novell "Star Trek"
    Novell DOS 7, a single-user, multi-tasking system derived from DR DOS
    Caldera OpenDOS 7.01
    Caldera DR-DOS 7.02 and higher

    Digital/Tandem Computers/Compaq/HP
    ITS (for the PDP-6 and PDP-10)
    Multi-Programming Executive (from HP)
    TOPS-10 (for the PDP-10)
    WAITS (for the PDP-6 and PDP-10)
    TENEX (from BBN, for the PDP-10)
    TOPS-20 (for the PDP-10)
    RSTS/E (multi-user time-sharing OS for PDP-11s)
    RSX-11 (multiuser, multitasking OS for PDP-11s)
    RT-11 (single user OS for PDP-11)
    VMS (originally by DEC, now by HP) for the VAX mini-computer range, Alpha and Intel Itanium 2; later renamed OpenVMS)
    Domain/OS (originally Aegis, from Apollo Computer who were bought by HP)
    Digital UNIX (derived from OSF/1, became HP's Tru64 UNIX)

    OSE Flexible, small footprint, high-performance RTOS for control processors

    Towns OS


    Google Chrome OS is designed to work exclusively with web applications. Announced on July 7, 2009, Chrome OS is currently publicly available and was released summer 2011. The Chrome OS source code was released on November 19, 2009 under the BSD license as Chromium OS.
    Chromium OS is an open source operating system development version of Google Chrome OS. Both operating systems are based on the Ubuntu kernel.
    Android is an operating system for mobile devices. Android is based on Linux core.
    es is a computer operating system developed originally by Nintendo and since 2008 by Google. It is open source and runs natively on x86 platforms.

    Green Hills Software
    INTEGRITY Reliable Operating system
    INTEGRITY-178B A DO-178B certified version of INTEGRITY.
    µ-velOSity A lightweight microkernel.

    Heathkit/Zenith Data Systems
    HDOS; ran on the H8 and Heath/Zenith Z-89 series
    HT-11 (a modified version of RT-11) ran on the Heathkit H11

    HP Multi-Programming Executive; (MPE, MPE/XL, and MPE/iX) runs on HP 3000 and HP e3000 mini-computers.
    HP-UX; runs on HP9000 and Itanium servers - from small to mainframe-class computers.


    Intel Corporation
    iRMX; real-time operating system originally created to support the Intel 8080 and 8086 processor families in embedded applications.
    ISIS-II; "Intel Systems Implementation Supervisor" was THE environment for development of software within the Intel microprocessor family in the early 1980s on their Intellec Microcomputer Development System and clones. ISIS-II worked with 8 inch floppy disks and had an editor, cross-assemblers, a linker, an object locator, debugger, compilers for PLM (PL/I for microprocessors of the 8080/86 family), a BASIC interpreter, etc. and allowed file management through a console.

    On early IBM mainframes (1400, 1800, 701, 704, 709, 7090, and 7094)
    BESYS (for the IBM 7090)
    CTSS (The Compatible Time-Sharing System, developed at MIT's Computation Center for use on a modified IBM 7094)
    GM OS & GM-NAA I/O (for the IBM 704)
    IBSYS (tape based operating system for IBM 7090 and IBM 7094)
    IJMON (A bootable serial I/O monitor for loading programs for IBM 1400 and IBM 1800)
    SOS (SHARE Operating System, for the IBM 704 and 709)
    UMES (University of Michigan Executive System, for the IBM 704, 709, and 7090)

    On IBM S/360, S/370, and successor mainframes
    OS/360 and successors on IBM S/360, S/370, and successor mainframes
    OS/360 (first official OS targeted for the System/360 architecture),
    Saw customer installations of the following variations:
    PCP (Primary Control Program, a kernel and a ground breaking automatic space allocating file system)
    MFT (original Multi-programming with a Fixed number of Tasks, replaced by MFT II)
    MFT II (Multi-Programming with a Fixed number of Tasks, had up to 15 fixed size application partitions, plus partitions for system tasks, initially defined at boot time but redefinable by operator command)
    MVT (Multi-Programming Variable Tasks, had up to 15 application regions defined dynamically, plus additional regions for system tasks)
    OS/VS (port of OS/360 targeted for the System/370 virtual memory architecture, "OS/370" is not correct name for OS/VS1 and OS/VS2, but rather refers to OS/VS2 MVS and MVS/SP Version 1),
    Customer installations in the following variations:
    SVS (Single Virtual Storage, both VS1 & VS2 began as SVS systems)
    OS/VS1 (Operating System/Virtual Storage 1, Virtual-memory version of MFT II)
    OS/VS2 (Operating System/Virtual Storage 2, Virtual-memory version of OS/MVT but without multiprocessing support)
    OS/VS2 R2 (called Multiple Virtual Storage, MVS, eliminated most need for VS1)
    MVS/SE (MVS System Extensions)
    MVS/SP (MVS System Product)
    MVS/XA (MVS/SP V2. MVS supported eXtended Architecture, 31-bit addressing)
    MVS/ESA (MVS supported Enterprise System Architecture, horizontal addressing extensions: data only address spaces called Dataspaces; a Unix environment was available starting with MVS/ESA V4R3)
    OS/390 (Upgrade from MVS, with an additional Unix environment)
    z/OS (OS/390 supported z/Architecture, 64-bit addressing)
    DOS/360 and successors on IBM S/360, S/370, and successor mainframes
    BOS/360 (early interim version of DOS/360, briefly available at a few Alpha & Beta System/360 sites)
    TOS/360 (similar to BOS above and more fleeting, able to boot and run from 2x00 series tape drives)
    DOS/360 (Disk Operating System (DOS), multi-programming system with up to 3 partitions, first commonly available OS for System/360)
    DOS/360/RJE (DOS/360 with a control program extension that provided for the monitoring of remote job entry hardware (card reader & printer) connected by dedicated phone lines)
    DOS/VS (First DOS offered on System/370 systems, provided virtual storage)
    DOS/VSE (also known as VSE, upgrade of DOS/VS, up to 14 fixed size processing partitions )
    VSE/SP (program product replacing DOS/VSE and VSE/AF)
    VSE/ESA (DOS/VSE extended virtual memory support to 32-bit addresses (Extended System Architecture)).
    z/VSE (latest version of the four decades old DOS lineage, supports 64-bit addresses, multiprocessing, multiprogramming, SNA, TCP/IP, and some virtual machine features in support of Linux workloads)

    CP/CMS (Control Program/Cambridge Monitor System) and successors on IBM S/360, S/370, and successor mainframes

    CP-40/CMS (for System/360 Model 40)
    CP-67/CMS (for System/360 Model 67)
    VM/370 (Virtual Machine / Conversational Monitor System, virtual memory operating system for System/370)
    VM/XA (VM/eXtended Architecture for System/370 with extended virtual memory)
    VM/ESA (Virtual Machine / Extended System Architecture, added 31-bit addressing to VM series)
    z/VM (z/Architecture version of the VM OS with 64-bit addressing)
    Further information: History of CP/CMS
    TPF Line (Transaction Processing Facility) on IBM S/360, S/370, and successor mainframes (largely used by airlines)
    ACP (Airline Control Program)
    TPF (Transaction Processing Facility)
    z/TPF (z/Architecture extension)
    Unix-like on IBM S/360, S/370, and successor mainframes
    AIX/370 (IBM's Advanced Interactive eXecutive, a System V Unix version)
    AIX/ESA (IBM's Advanced Interactive eXecutive, a System V Unix version)
    OpenSolaris for IBM System z
    UTS (developed by Amdahl)
    Others on IBM S/360, S/370, and successor mainframes:
    BOS/360 (Basic Operating System)
    MTS (Michigan Terminal System for IBM System/360)
    RTOS/360 (IBM's Real Time Operating System, ran on 5 NASA custom System/360-75s)
    TOS/360 (Tape Operating System)
    TSS/360 (IBM's Time Sharing System)
    MUSIC/SP (developed by McGill University for IBM System/370)
    ORVYL and WYLBUR (developed by Stanford University for IBM System/360)

    On IBM PC and Intel x86 based architectures
    PC DOS 1.x, 2.x, 3.x (developed jointly with Microsoft)
    IBM DOS 4.x, 5.0 (developed jointly with Microsoft)
    PC DOS 6.1, 6.3, 7, 2000, 7.10
    See also: MS-DOS and Windows
    OS/2 1.x (developed jointly with Microsoft)
    OS/2 2.x
    OS/2 Warp 3
    OS/2 Warp 4
    eComStation (Warp 4.5/Workspace on Demand, rebundled by Serenity Systems International)
    4680 OS version 1 to 4, a POS operating system based on Digital Research's Concurrent DOS 286 and FlexOS 286 1.xx
    4690 OS version 1 to 6.2, a successor to 4680 OS based on Novell's FlexOS 286/FlexOS 386 2.3x

    On other IBM hardware platforms
    IBM Series/1
    EDX (Event Driven Executive)
    RPS (Realtime Programming System)
    CPS (Control Programming Support, subset of RPS)
    SerIX (Unix on Series/1)
    IBM 1130
    DMS (Disk Monitor System)
    IBM 1800
    TSX (Time Sharing eXecutive)
    MPX (Multi Programming eXecutive)
    IBM 8100
    DPCX (Distributed Processing Control eXecutive)
    DPPX (Distributed Processing Programming Executive)
    IBM System/3
    DMS (Disk Management System)
    IBM System/34, IBM System/36
    SSP (System Support Program)
    IBM System/38
    CPF (Control Program Facility)
    IBM System/88
    Stratus VOS (developed by Stratus, and used for IBM System/88, Original equipment manufacturer from Stratus)
    AS/400, iSeries, System i, Power Systems i Edition
    OS/400 (descendant of System/38 CPF, include System/36 SSP environment)
    i5/OS (extends OS/400 with significant interoperability features)
    IBM i (extends i5/OS)
    AIX (Advanced Interactive eXecutive, a System V Unix version)
    AOS (a BSD Unix version, not related to Data General AOS)
    IBM Workplace OS (Microkernel based operating system, developed and canceled in 1990s)
    K42 (open-source research operating system on PowerPC or x86 based cache-coherent multiprocessor systems)
    Dynix (developed by Sequent, and used for IBM NUMA-Q too)

    International Computers Limited
    J and MultiJob for the System 4 series mainframes
    GEORGE 2/3/4 GEneral ORGanisational Environment, used by ICL 1900 series mainframes
    Executive, used on the 290x range of minicomputers
    TME, used on the ME29 minicomputer
    ICL VME, including early variants VME/B VME/K, appearing on the ICL 2900 Series and Series 39 mainframes, implemented in S3

    LynuxWorks (originally Lynx Real-time Systems)

    Micrium Inc.
    MicroC/OS-II (Small pre-emptive priority based multi-tasking kernel)
    MicroC/OS-III (Small pre-emptive priority based multi-tasking kernel, with unlimited number of tasks and priorities, and round robin scheduling)

    Xenix (licensed version of Unix; licensed to SCO in 1987)
    MSX-DOS (developed by MS Japan for the MSX 8-bit computer)
    MS-DOS (developed jointly with IBM, versions 1.0–6.22)
    Windows 1.0 (Windows 1 - Based on Visi On) April 30, 1985
    Windows 2.0 (Windows 2) December 9, 1987
    Windows 3.0 (Windows 3 - Is the first version of Windows to make substantial commercial impact) May 22, 1990
    Windows 3.1x (Windows 3.1) March 18, 1992
    Windows 3.2 (Chinese-only release) November 19, 1992
    Windows for Workgroups 3.11 January 21, 1993
    Windows 95 (Windows 4) August 24, 1995
    Windows 98 (Windows 4.1) June 25, 1998
    Windows Millennium Edition (Windows Me - Windows 4.9) September 14, 2000
    Windows NT (Full 32-bit kernel, not dependent on MS-DOS)
    Windows NT 3.1 July 27, 1993
    Windows NT 3.5 September 21, 1994
    Windows NT 3.51 May 30, 1995
    Windows NT 4.0 July 31, 1996
    Windows 2000 (Windows NT 5.0), February 17, 2000
    Windows XP (Windows NT 5.1) October 25, 2001
    Windows Server 2003 (Windows NT 5.2) April 24, 2003
    Windows Fundamentals for Legacy PCs (based on Windows XP) July 8, 2006
    Windows Vista (Windows NT 6.0) January 31, 2007
    Windows Azure (based on Windows Vista) 2009
    Windows Home Server (based on Windows Server 2003) February 28, 2008
    Windows Server 2008 (based on Windows Vista) February 28, 2008
    Windows 7 (Windows NT 6.1) October 22, 2009
    Windows Server 2008 R2 (based on Windows 7) October 22, 2009
    Windows Home Server 2011 (based on Windows Server 2008 R2) April 6, 2011
    Windows 8 Consumer Preview (First downloadable release) March 1, 2012
    Windows 8 Server Beta (First downloadable release) March 15, 2012
    Windows CE (OS for handhelds, embedded devices, and real-time applications that is similar to other versions of Windows) May 30, 2002
    Windows CE 3.0 December 25, 2002
    Windows CE 5.0 February 27, 2004
    Windows CE 6.0 May 5, 2004
    Windows Mobile (based on Windows CE, but for a smaller form factor) April 14, 2005
    Windows Phone October 21, 2010
    Singularity - A research operating system written mostly in managed code (C#) November 30, 2009
    Midori - A managed code operating system July 21, 2010
    Xbox and Xbox 360 OS custom operating systems May 12, 2005 and August 10, 2006

    MontaVista Software
    MontaVista Linux
    MontaVista Mobilinux

    NCR Corporation
    TMX - Transaction Management eXecutive

    NetWare network operating system providing high-performance network services. Has been superseded by Open Enterprise Server line, which can be based on NetWare or Linux to provide the same set of services.
    Open Enterprise Server, the successor to NetWare.

    Quadros Systems
    RTXC Quadros RTOS proprietary C-based RTOS used in embedded systems ows

    TSOS, first OS supporting virtual addressing of the main storage and support for both timeshare and batch interface

    Unison RTOS Ultra Tiny Embedded Linux Compatible RTOS
    DSPnano RTOS Ultra Tiny Embedded Linux Compatible RTOS
    Unison/Reliant V3 pSOS derivative RTOS

    SCO / The SCO Group[1]
    Xenix, Unix System III based distribution for the Intel 8086/8088 architecture
    Xenix 286, Unix System V Release 2 based distribution for the Intel 80286 architecture
    Xenix 386, Unix System V Release 2 based distribution for the Intel 80386 architecture
    SCO Unix, SCO UNIX System V/386 was the first volume commercial product licensed by AT&T to use the UNIX System trademark (1989). Derived from AT&T System V Release 3.2 with an infusion of Xenix device drivers and utilities plus most of the SVR4 features
    SCO Open Desktop, the first 32-bit graphical user interface for UNIX Systems running on Intel processor-based computers. Based on SCO Unix
    SCO OpenServer 5, AT&T UNIX System V Release 3 based
    SCO OpenServer 6, SVR5 (UnixWare 7) based kernel with SCO OpenServer 5 application and binary compatibility, system administration, and user environments
    UnixWare 2.x, based on AT&T System V Release 4.2MP
    UnixWare 7, UnixWare 2 kernel plus parts of 3.2v5 (UnixWare 2 + OpenServer 5 = UnixWare 7). Referred to by SCO as SVR5

    Scientific Data Systems (SDS)
    Berkeley Timesharing System for the SDS 940

    PikeOS is a certified real time operating system for safety and security critical embedded systems

    TRON Project
    TRON (open real-time operating system kernel)

    Unisys OS 2200 operating system

    UNIVAC (later Unisys)
    EXEC I
    EXEC 8 Ran on 1100 series.
    VS/9, successor to RCA TSOS

    Wang Laboratories
    WPS Wang Word Processing System. Micro-code based system.
    OIS Wang Office Information System. Successor to the WPS. Combined the WPS and VP/MVP systems.

    Wind River Systems
    VxWorks Small footprint, scalable, high-performance RTO


    Part 1
    Last edited by gore; July 11th, 2012 at 10:33 PM.

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