Operating Systems Database


Total OS in database (05 December 2019) : 2729
Corresponding OS from query : 2658

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Name
Year
Description Platform Company Link
µ-velOSity
2006
Lightweight microkernel.
-
Green Hills Software, USA
_unknown
1950s
Early machine capable of distributing computing.
Lincoln TX-2
Lincoln Lab, USA
_unknown
1953
Early machine capable of distributing computing.
DYSEAC
National Bureau of Standards, USA
_unknown
1955c
Very early operating system developed by General Motors for the IBM 701. Unnamed.
IBM 701
General Motors, USA
-
_unknown
1960s
Unix-like OS for IBM System/360 and sucessors.
IBM System/360, System/370, and successors
IBM, USA
_unknown
1960s
Operating system for IBM mainframes.
IBM 1400, 1800, 701, 704, 709, 7090, 7094
IBM, USA
-
_unknown
1970
Monitor and Operating system for the PDP-8/S computer system.
DEC PDP-8/S
United States Naval Postgraduate School, USA
_unknown
1979
Xerox 1100 series of Lisp machines used an operating system also written in Interlisp, and was also ported to a virtual machine called "Medley".
Xerox 1100
Xerox, USA
-
_unknown
1980s
Texas Instruments' Explorer Lisp machine workstations also had systems code written in Lisp Machine Lisp.
Lisp machine
Texas Instruments, USA
_unknown
2000s
Unnamed NetBSD variant for Airport Extreme and Time Capsule.
Router
Apple, USA
-
Zygomatic
2004
Operating system designed around idiomatic C++ concepts such as RAII, iterators, and streams.
-
Bregmasoft
ZSDOS
1980s
CP/M 2.2 with ZSDOS as BDOS replacement.
Altair
USA
ZRTS
1978c
Operating System for the Z8000.
Z8000
Zilog, USA
-
Zot OS
1990s
Small free OS with a GUI.
-
-
ZEUS
1978c
Version of UNIX.
-
Zilog, USA
-
Zeroshell (2 versions)
2006
Small open-source Linux distribution for servers and embedded systems which aims to provide network services.
IA-32
Fulvio Ricciardi
Zephyr
2016
Small real-time operating system for connected, resource-constrained devices supporting multiple architectures and released under the Apache License 2.0.
ARM (Cortex-Mx), x86, ARC, RISC-V, Nios II, Xtensa
Linux Foundation, Wind River Systems
Zenix
1980s
Zenith Unix.
Zenith computers
Zenith, USA
-
ZCPR3
1980s
based on the original by Richard Conn.
Altair
Richard Conn, USA
Z3PLUS
1980s
Z-System based on CP/M 3.
Altair
USA
z/VSE
2005
Virtual Storage Extended. 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.
IBM System z
IBM, USA
z/VM
2000
z/Architecture version of the VM OS with 64-bit addressing.
IBM System z
IBM, USA
z/TPF
2005
z/Architecture extension.
IBM System z
IBM, USA
-
z/OS (3 versions)
2000
OS/390 supported z/Architecture, 64-bit addressing.
IBM System z
IBM, USA
-
z/Linux
1999
Linux on IBM Z (or Linux on z for short, and previously Linux on z Systems) is the collective term for the Linux operating system compiled to run on IBM mainframes, especially IBM Z and IBM LinuxONE servers.
IBM System z
IBM, USA
YunOS
2016
Mobile operating system.
-
Alibaba Group, China
-
Y@SOS
2000s
Yet Another Small OS. Free real-time OS especially dedicated to ARM Cortex-M3 micro-controllers.
Cortex-M3, STM32
-
XYLEM
1985c
Operating system for the Cedar Multiprocessor, a high-speed, floating point, shared memory. Based on version 4.2 of Unix.
Cedar Multiprocessor
University of Illinois, USA
-
Xv6
2006
Teaching operating system developed in the summer of 2006 for MIT's operating systems course.
-
MIT, USA
XTS-400
2003
Multilevel secure computer operating system.
x86
BAE Systems, UK
XTS-300
1994
Transitioned from proprietary, mini-computer hardware to COTS, Intel x86 hardware.
x86
BAE Systems, UK
XTS-200
1992
Designed as a general-purpose operating system supporting a Unix-like application and user environment.
x86
BAE Systems, UK
XOS (3)
2000s
X Operating System.
-
Jascha Wetzel
XOS (2)
1981<
Operating System for the experimental X-Tree Computer Architecture.
-
University of California at Berkelely, USA
-
XOS (1)
1970<
Batch Processing OS for the Xerox Data Systems SIGMA Computers.
Xerox Data Systems SIGMA
USA
-
XOPE
2000s
Free Micro-Kernel Based Open Source Operating System.
i80386
Frank Anemaet, Daniel Pischl, Netherlands
Xok
1990s
Newest research exokernel to date. XOK is able to compile most UNIX programs (perl, gcc, emacs, etc.) with little or no change, and has equal to or greater speed than FreeBSD when using standard libOS's.
-
MIT, USA
-
Xoberon
1990s
Hard real-time operating system (HRTOS), deployed for high-end mechatronic products control. The goal of XOberon is about providing a framework for non-computer-scientists, looking for a rapid application development (RAD) tool for programming embedded applications.
Motorola MVME162, PowerPC
ETH Zurich, Switzerland
XO/2
1990s
Industrial RTOS based on Oberon. Object-oriented, hard-real time system software and framework, designed for safety, extensibility and abstraction.
-
ETH Zurich, Switzerland
XMK
2000s
eXtreme Minimal Kernel. Real-time operating system that is designed for minimal RAM/ROM use.
-
Shift-Right Technologies, USA
XINU
1981
Limited Unix lookalike developed for educational purposes, for use with a text by Comer "XINU Is Not Unix.
DEC PDP-11 and VAX systems, Sun-2 and Sun-3 workstations, Intel x86, PowerPC G3 and MIPS
Purdue University, USA
Xenomai
2001
Real-time development framework cooperating with the Linux kernel, to provide a pervasive, interface-agnostic, hard real-time support to user space applications, seamlessly integrated into the Linux environment.
x86, x86-64, PowerPC, ARM, Analog Devices Blackfin BF52x, BF53x, BF54x and BF56x
-
Xenix 386
1987
Xenix 386, Unix System V Release 2 based distribution for the Intel 80386 architecture.
i386
SCO Group, USA
Xenix 286
1984
Xenix 286, Unix System V Release 2 based distribution for the Intel 80286 architecture.
i286
SCO Group, USA
XENIX (2 versions)
1980
Licensed version of Unix. Licensed to SCO in 1987.
IBM PC compatibles, x86, DEC PDP-11, Z8001, 68000
Microsoft, SCO, USA
Xen
1990s
Virtualisation kernel to which Linux has been ported, NetBSD and XP are being ported, such that you can run as many of each of these OSs (and others if they are ported or written) on a single box.
-
University of Cambridge, UK
Xbox One system software
2013
Operating system for the eighth-generation home video game console, Xbox One. It is a Windows-based operating system using the Hyper-V virtual machine monitor.
Microsoft Xbox 360
Microsoft, USA
Xbox 360 system software
2005
Udateable software and operating system for the Xbox 360.
Microsoft Xbox 360
Microsoft, USA
X-OS
2000s
X-OS - French OS Project
-
AlAdDiN
WYLBUR
1967
Operating system for the IBM System/360.
IBM System/360
Stanford University, USA
-
WPS
1970s
Wang Word Processing System. Micro-code based system.
Wang WPS
Wang Laboratories, USA
Workplace OS
1991
Microkernel based operating system including OS/2, developed and canceled in the 1990s.
IA-32, PowerPC, ARM
IBM, USA
Wombat OS
2004
High-performance virtualized Linux. microkernel OS; usually a real time embedded OS.
x86, ARM and MIPS
National ICT Australia, Australia
WIZRD
1980s
Small OS for the M6800.
Motorola 6800
Wintek, USA
-
WISDOM
2003
32-bit operating system with a primitive shell implemented.
-
University of Madras, India
Windows XP (6 versions)
2001
Aka Windows NT 5.1
IBM PC compatibles
Microsoft, USA
Windows Vista (2 versions)
2006
Aka Windows NT 6.0
IBM PC compatibles
Microsoft, USA
Windows Server 2016 (1607)
2016
-
-
-
Windows Server 2012 R2
2013
-
-
-
-
Windows Server 2012
2012
Based on Windows 8.
-
-
Windows Server 2008 R2
2009
Based on Windows 7.
-
-
Windows Server 2008
2008
Based on Windows Vista.
-
-
Windows Server 2003 Service Pack 2
2007
-
-
-
-
Windows Server 2003 Service Pack 1
2005
-
-
-
-
Windows Server 2003 R2
2006
-
-
-
-
Windows Server 2003
2003
Aka Windows NT 5.2
-
-
Windows Server (11 versions)
2003
Brand name for a group of server operating systems released by Microsoft.
IBM PC compatibles
Microsoft, USA
Windows Phone (5 versions)
2010
Windows Phone mobile client operating system.
Windows Phone
Microsoft, USA
Windows NT (4 versions)
1993
Full 32-bit or 64-bit kernel, not dependent on MS-DOS. Part of Windows Server Family.
IBM PC compatibles
Microsoft, USA
Windows Mobile 2003
2003
-
-
-
-
Windows Mobile (5 versions)
2000
Based on Windows CE, but for a smaller form factor.
-
Microsoft, USA
Windows Millennium Edition
2000
Aka Windows ME (Windows 4.9). Familial version of Windows 2000.
IBM PC compatibles
Microsoft, USA
Windows Home Server 2011
2011
Based on Windows Server 2008 R2.
IBM PC compatibles
Microsoft, USA
Windows Home Server
2007
Based on Windows Server 2003.
IBM PC compatibles
Microsoft, USA
Windows Fundamentals for Legacy PCs
2005
Thin client operating system based on Windows XP Embedded and is optimized for older, less powerful hardware.
IBM PC compatibles
Microsoft, USA
Windows for Workgroups (2 versions)
1992
Extension that allowed users to share their resources and to request those of others without a centralized authentication server. Originally codenamed Winball and later Sparta.
IBM PC compatibles
Microsoft, USA
Windows Embedded POSReady 2009
2009
Based on Windows XP with SP3, this version offers more features over Windows Embedded for Point of Service such as Full Localization and XPS support if .NET Framework 3.5 or higher is installed.
-
-
Windows Embedded POSReady
2000s
Updated version of Windows Embedded for Point of service, named Windows embedded POSReady 2009.
-
-
Windows Embedded Mobile
2000s
See Windows 10 IoT Mobile. Based on Windows 10 Mobile, is the successor to Embedded Handheld.
-
-
Windows Embedded Industry
2000s
Formerly Windows Embedded POSReady and Windows Embedded for Point of Service, is an operating system subfamily developed by Microsoft as part of its Windows Embedded family of products.
-
-
Windows Embedded for Point of Service (WEPOS)
2004>
Based on Windows XP with SP2 and designed for use in Point of Service situations, WEPOS expanded Microsoft's Windows Embedded family of products.
-
-
Windows Embedded Enterprise Mobile
2000s
See Windows 10 IoT Mobile Enterprise. Adds ARM support, multiple user profiles, advanced lockdown, and other capabilities, but is otherwise identical to the normal Mobile version.
-
-
Windows Embedded Enterprise
2009
See Windows 10 IoT Enterprise. Successor to both Embedded Industry and Embedded Standard with plain unlabeled, Retail/Thin Client, Tablet, and Small Tablet versions available.
-
-
Windows Embedded Core Pro
2000s
See. Windows 10 IoT Core Pro. Provides the ability to defer and control updates and is licensed only via distributors; it is otherwise identical to the normal IoT Core version.
-
-
Windows Embedded Core
2000s
See Windows 10 IoT Core. Considered by some to be the successor to Windows Embedded Compact, although it maintains very little compatibility with it. Optimized for smaller and lower-cost industry devices, it is also provided free of charge for use in devices like the Raspberry Pi for hobbyist use.
-
-
Windows Embedded CE
1996
See Windows CE. Version of Windows Embedded for very small computers and embedded systems, including consumer electronics devices like set-top boxes and video game consoles.
-
-
Windows Embedded Automotive
1998
Formerly Microsoft Auto, Windows CE for Automotive, Windows Automotive, and Windows Mobile for Automotive, is an embedded operating system based on Windows CE for use on computer systems in automobiles.
-
-
Windows Embedded 8.1 Industry
2013
Based on Windows 8.1.
-
-
Windows Embedded 8 Industry
2013
Based on Windows 8. Available in both Pro and Enterprise versions. The Pro version is only available pre-installed on OEM devices, while the Enterprise version is available through the volume licensing channel only.
-
-
Windows Embedded (15 versions)
1996
Released in 1999 as Windows NT Embedded 4.0. See IoT.
Embedded devices
Microsoft, USA
Windows CE (9 versions)
1996
Operating system for handhelds, embedded devices, and real-time applications that is similar to other versions of Windows.
x86, MIPS, ARM, SuperH
Microsoft, USA
Windows Azure
2010
Microsoft Azure (formerly Windows Azure). Cloud computing service created by Microsoft for building, testing, deploying, and managing applications and services through a global network of Microsoft-managed data centers.
IBM PC compatibles
Microsoft, USA
Windows 98 (1 versions)
1998
Aka Windows 4.1. Codename Memphis. Like its predecessor, Windows 98 is a hybrid 16-bit and 32-bit monolithic product with the boot stage based on MS-DOS.
IBM PC compatibles
Microsoft, USA
Windows 95
1995
Aka Windows 4.0. Codename Chicago. Windows 95 merged Microsoft's formerly separate MS-DOS and Windows products, and featured significant improvements over its predecessor, most notably in the graphical user interface (GUI) and in its simplified "plug-and-play" features.
IBM PC compatibles
Microsoft, USA
Windows 8 (1 versions)
2012
Aka Windows NT 6.2. Windows 8 introduced major changes to the operating system's platform and user interface to improve its user experience on tablets.
IBM PC compatibles
Microsoft, USA
Windows 7
2009
Aka Windows NT 6.1. Code name Blackcomb and Vienna.
IBM PC compatibles
Microsoft, USA
Windows 3.2
1993
Chinese-only release of Windows 3.
IBM PC compatibles
Microsoft, USA
Windows 3.11
1993
Improved version of Windows 3.1.
IBM PC compatibles
Microsoft, USA
Windows 3.1
1992
Same as Windows 3.0 except required a minimum of a 286 PC with 1 MB of RAM to run, removed CGA support, TrueType font support, Ehanced Mode support.
IBM PC compatibles
Microsoft, USA
Windows 3.0
1990
Second version of Microsoft Windows including a significantly revamped user interface as well as technical improvements to make better use of the memory management capabilities of Intel's 80286 and 80386 processors.
IBM PC compatibles
Microsoft, USA
Windows 2000 (4 versions)
2000
Aka Windows NT 5.0. Four editions of Windows 2000 were released: Professional, Server, Advanced Server, and Datacenter Server.
IBM PC compatibles
Microsoft, USA
Windows 2.0
1987
Second version of Microsoft Windows.
IBM PC compatibles
Microsoft, USA
Windows 10 (10 versions)
2015
Aka Windows NT 10. Series of personal computer operating systems produced by Microsoft as part of its Windows NT family of operating systems.
IBM PC compatibles
Microsoft, USA
Windows 1.0 (1 versions)
1985
First version of Microsoft Windows.
IBM PC compatibles
Microsoft, USA
Windows
1985
16-bit and 32-bit preemptive and cooperative multitasking, running atop MS-DOS.
IBM PC compatibles
Microsoft, USA
WICAT Multiuser Computer System (WMCS)
1980s
MC-68K multiuser OS for their proprietary microcomputers, used mainly for CBT systems.
WICAT Systems
WICAT, USA
WFS File Server
1979
Simple share file system for distributed environment.
Xerox Alto
USA
webOS
2009
See LG webOS.
-
Palm, USA
Waterloo Port
1980s
PC-DOS version.
IBM PC compatibles
Waterloo Microsystems, USA
-
watchOS (12 versions)
2015
Mobile operating system of the Apple Watch.
Apple Watch
Apple, USA
Wang VS Operating System (VSOS)
1977
Used on the VS line of minicomputer systems.
Wang VS line
Wang Laboratories, USA
-
WAITS
1967
SAIL, Stanford Artificial Intelligence Laboratory. Time-sharing system for DEC PDP-6 and PDP-10, later TOPS-10.
DEC PDP-6 and PDP-10
DEC, USA
VxWorks
1987
Small footprint, scalable, high-performance RTOS for embedded microprocessor based systems.
x86, x86-64, MIPS, PowerPC, SH-4, ARM
Wind River Systems, USA
VULCAN
1984<
Operating System for Harris computers.
Harris computers
USA
-
VTOS
1979
Virtual Technology’s Operating System. The second TRS?80 Model I operating system.
Tandy TRS-80
Randy Cook, Virtual Technology, USA
VSTa
1990s
Valencia's Simple Tasker. Was an operating system with a microkernel architecture, with all device drivers and file systems residing in userspace mode.
i386, Motorola 68030
Andy Valencia
VSOS
1975c
Virtual Storage Operating System. Operating system for the Cyber 205 pipelined processor.
Cyber 205
USA
-
VSE/SP
1980s
Program product replacing DOS/VSE and VSE/AF.
IBM mainframes
IBM, USA
VSE/ESA
1991
DOS/VSE extended virtual memory support to 32-bit addresses (Extended System Architecture).
IBM mainframes
IBM, USA
VS/9
1968c
Successor to RCA TSOS. Discontinued computer operating system available for the UNIVAC Series 90 mainframes during the late 1960s through 1980s.
UNIVAC Series 90 mainframes
Sperry UNIVAC, USA
VS-2
1972
IBM Virtual Storage OS. See OS/VS2.
-
IBM, USA
-
VS-1
1972
IBM Virtual Storage OS. See OS/VS1.
-
IBM, USA
-
VS
1980s
Operating system for Wang VS series systems.
Wang VS
Wang Laboratories, USA
-
VRX
1970s
Virtual Resource eXecutive. Proprietary operating system on the NCR Criterion series, and later the V-8000 series of mainframe computers manufactured by NCR during the 1970s and 1980s. It replaced the B3 Operating System.
NCR Criterion, V-8000 series
NCR, USA
VRTX
1981
Versatile Real-Time Executive. Real-time operating system suitable for both traditional board-based embedded systems and SoC architectures. It has been superseded by the Nucleus RTOS.
ARM, MIPS, PowerPC, RISC
Mentor Graphics, USA
VPS/VM
1977
Virtual Processing System/Virtual Machine. Was an operating system that ran on IBM System/370 – IBM 3090 computers at Boston University in general use from 1977 to around 1990, and in limited use until at least 1993.
IBM System/370, IBM 3090
IBM, USA
-
VOSK/FS
1995
Replaced the department computer operating system VOSK, was developed as a mid-range total management server with the features of a database server, a computing server, and a management server.
Hitachi MP5600 / MP5400
Hitachi, Japan
VOSK
1988
Small/medium OS for M-620, M-630 and M-640.
Hitachi HITAC M-620, M-630 and M-640
Hitachi, Japan
VOS3 (4 versions)
1977c
Virtual-storage Operating System 3. For its IBM-compatible mainframes, based on IBM's MVS.
Hitachi HITAC M series
Hitachi, Japan
-
VOS2
1975
Was the first OS for the HITAC M series, which was a series of Hitachi's general-purpose computers
Hitachi HITAC M series
Hitachi, Japan
-
VOS1 (3 versions)
1976
Operating system for lower models in Hitachi's HITAC M series of general-purpose computers, was the second OS in the M series following VOS2.
Hitachi HITAC M series
Hitachi, Japan
-
VOS0
1978
Operating system for HITAC L series distributed processing computers.
Hitachi HITAC L-330
Hitachi, Japan
VOS (3)
1980s
Virtual Operating System. Proprietary operating system running on Stratus Technologies fault-tolerant computer systems. With strong influence from Multics.
i860, x86, PA-RISC, 68000
Stratus Technologies, USA
VOS (2)
1984<
Operating System for Harris 600, 700, 800 computers.
Harris 600, 700, 800
USA
-
VOS (1)
1973<
Virtual machine OS running on the Michigan Terminal System.
Michigan Terminal System
USA
-
VORTEX
1974<
Omnitasking realtime executive for Varian minicomputers.
Varian minicomputers
USA
-
VMS (8 versions)
1977
Originally by DEC and HP now by VMS Software Inc. for the VAX mini-computer range, Alpha and Intel Itanium i2 and i4; later renamed OpenVMS.
DEC VAX-11
DEC, USA
-
VMOS
1968c
Virtual Memory Operating System. Timesharing OS for the RCA Spectra 70.
RCA Spectra 70
RCA, USA
-
VMiX-x86
2000s
DOS extender that adds Unix like multi-user capabilities. Version 3.0 will be DPMI compliant and will use a new portable microkernel named 'BABy'.
-
Tony Borras
VMiX x86
2000s
New Version of this Multiuser DOS, originally introduced in 1984, The design of VMiX has changed to allow it to migrate from IA32 architectures to the newer AMD64 and IA64 environments.
x86
SysDev, USA
VME (4 versions)
1973
Virtual Machine Environment. Mainframe operating system. Implementation language S3 (ALGOL 68).
ICL 2900 Series, ICL Series 39 mainframes
ICL, UK
VM2000
1975
Hypervisor from Fujitsu (formerly Siemens Nixdorf Informationssysteme) designed specifically for use with the BS2000 operating system. It is an EBCDIC-based operating system.
Siemens BS2000
Siemens, Germany
-
VM/XA SP
1988
Virtual Machine/Extended Architecture System Product.
IBM System/370
IBM, USA
-
VM/XA SF
1985
Virtual Machine/Extended Architecture System Facility. Allow the machine to provide execution in the virtual-machine environment of most of the instructions (including many privileged instructions) and most of the facilities (such as dynamic address translation) of both the System/370 and the 370-XA architectures.
IBM System/370
IBM, USA
-
VM/XA MA
1984
Virtual Machine/Extended Architecture Migration Assistance. Tool to assist in migration from MVS/370 to MVS/XA.
IBM System/370
IBM, USA
-
VM/XA
1987
VM/eXtended Architecture for System/370 with extended virtual memory.
IBM System/370
IBM, USA
VM/SP
1980
Virtual Machine/System Product.
IBM System/370
IBM, USA
-
VM/SEPP
1972
Virtual Machine/Extended Product. Functional ehancement to VM/370.
IBM System/370
IBM, USA
-
VM/PC
1984<
Version of VM/370 for the PC/370.
IBM System/370
IBM, USA
-
VM/ESA
1990
Virtual Machine / Extended System Architecture, added 31-bit addressing to VM series.
IBM System/370
IBM, USA
VM/BSEPP
1972
Virtual Machine/Basic Extended Product. Functional ehancement to VM/370.
IBM System/370
IBM, USA
-
VM/370
1972
Virtual Machine Facility/370. Virtual memory operating system. To assist customers in migration from OS/360 to OS/VS.
IBM System/370
IBM, USA
Visopsys
2001
Visual Operating System. The operating system is licensed under the GNU GPL.
IA-32
Andy McLaughlin, Canada
Visi On
1983
First GUI for early PC machines. Not commercially successful.
IBM PC compatibles
VisiCorp, USA
Virtual Memory System (VMS)
1977
DEC's proprietary operating system originally produced for its VAX minicomputer. Renamed "OpenVMS" around version 5.5.
DEC VAX
DEC, USA
-
VINO
1994c
Operating system built of reusable, replacable components that can be organized by the end-user, even code running in kernel mode.
-
Harvard University, USA
VERSAdos
1978c
MS-DOS compatible system for 68000.
68000
Motorola, USA
-
vEOS
2010s
Platform release of EOS that is supported on Amazon Web Service (AWS), Microsoft Azure and other public clouds.
-
Arista, USA
VENUS
1972
Experimental OS for a modified Interdata minicomputer, based on matching the computer architecture to the operating system.
Interdata minicomputers
Barbara Liskov, USA
-
VENIX (5 versions)
1983
Discontinued version of the Unix operating system for low-end computers.
DEC PRO-350 (PDP-11 comp.), DEC Rainbow 100, IBM PC
VenturCom, USA
velOSity
1990s
Real-time operating system.
Power Architecture, ARM/XScale, MIPS, x86/Pentium, ColdFire, Blackfin, OMAP, DaVinci
Green Hills Software, USA
VAXELN
1984<
Realtime object-oriented OS for the MicroVAX.
DEC MicroVAX
USA
-
VAX/VMS
1978c
Standard operating system for DEC VAX. Based on RSX-11.
DEC VAX
USA
-
VAX VMM
1988
Virtual-machine monitor. TCSEC A1-class, VMM for VAX computers.
DEC VAX
DEC, USA
-
Vapour
1990s
Project to build out a Lisp-based OS based on a persistent object store and has quite a few other interesting principles.
-
Australia
V2_OS
1990s
Operating system focused on speed for projects like real-time video serving, etc.
-
V2 Lab, Netherlands
V
1981
Discontinued microkernel operating system that was developed by faculty and students in the distributed systems group at Stanford University.
Sun workstations, MicroVAX workstations
Stanford University, USA
UTX-32
1984<
Unix-based OS that included both BSD and System V characteristics. It was one of the first Unix based systems to receive NSA's C2 security level certification.
Gould Powernode 9080
Gould CSD, USA
-
UTS/VS
1974
Operating system for Mitsubishi COSMO mainframes.
Mitsubishi COSMO series
Mitsubishi, Japan
-
UTS (2)
1981
Discontinued implementation of the UNIX operating system for IBM mainframe (and compatible) computers.
Amdahl 599x, Fujitsu Global Server, IBM ES/9000 series, IBM G4, G5 and G6
Amdahl, USA
UTS (1)
1971
Universal Time-Sharing System. Time Sharing Operating System for Xerox SIGMA computers.
Xerox SIGMA
Xerox, USA
UTM
1970
Universal Time-sharing Monitor. Operating system for a large-scale system capable of simultaneously performing batch processing, remote batch processing, real-time processing and time-sharing processing.
Mitsubishi MELCOM-7000
Mitsubishi, Japan
-
USX
1984<
Real-time development system for 8086, 68000.
i8086, 68000
United States Software, USA
-
uSmartx
2000s
Non-preemptive, multitasking, priority based RTOS.
ARM7TDMI, AVR, H8
Marko Panger
uOS
2000s
Operating system for embedded microcontrollers.
AVR, ARM, MIPS32, MSP430, i386
Russia
Unununium
1990s
Aka Uuu, "operating engine" is "a highly componentized system, where each component can be dynamically loaded, unloaded, replaced at runtime.
x86
Dave Poirier, International
UNOS
1981
First, now discontinued, 32-bit Unix-like real-time operating system (RTOS) with real-time extensions.
68000
Charles River Data Systems, USA
-
UnixWare (2 versions)
1992
Unix operating system. It was originally released by Univel, a jointly owned venture of AT&T's Unix System Laboratories (USL) and Novell.
-
Univel, Novell, SCO, Caldera Systems, Caldera International, The SCO Group, Xinuos, USA
UNIX/32V
1979
Early version of the Unix operating system. 32V was a direct port of the Seventh Edition Unix to the DEC VAX architecture.
DEC VAX
Bell Labs, USA
UNIX-RTR
1980s
See DMERT.
DEC PDP-11
Bell Labs, USA
-
UNIX Time-Sharing System (10 versions)
1971
"Ken's new system," for its creator (Ken Thompson), officially Unics and then Unix, the prototypic operating system eated in Bell Labs in 1969 that formed the basis for the Unix family of operating systems.
DEC PDP
Bell Labs, USA
UNIX (9 versions)
1971
Family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix.
-
Bell Labs, USA
Univention Corporate Server
2004
Server operating system derived from Debian GNU/Linux with an integrated management system for the central and cross-platform administration of servers, services, clients, desktops and users as well as virtualized computers operated in UCS.
Intel 386, AMD64
Univention, Germany
Unity
1982
Version of UNIX for the PDP-11 and VAX.
DEC PDP-11 and VAX
Human Computing Resources, USA
-
Unisys OS 2200 operating system
1967
Operating system for the Unisys ClearPath Dorado family of mainframe systems.
Unisys ClearPath Dorado
Unisys, USA
Unisys MCP
1961
Master Control Program. Proprietary operating system of the Burroughs small, medium and large systems, including the Unisys Clearpath/MCP systems.
Burroughs mainframes
Unisys, USA
Unison
2000s
RTOS 32 Bit Open Standards, Linux Compatible, Ultra Tiny Size, Modularity, POSIX-compliant RTOS that supports a variety of wireless modules and provides a complete set of security protocols.
Renesas, TI, Cypress/Spansion, Freescale/NXP, Microsemi, ST Microelectronics microcontrollers
RoweBots, USA
Unique OS
1995>
Pretty standard, kernel based OS.
-
Michael Gerhards, Germany
-
Uniq
1970s
Version of UNIX for PDP-11.
DEC PDP-11
Uniq Digital Technologies, USA
-
UniPlus+
1980s
Discontinued commercial version of the Unix System III and System V operating systems for the 68000.
68000
Unisoft Systems, USA
UNIOS (4 versions)
1974
Operating system for the FACOM V series, developed jointly by Fujitsu, USAC Electronic Industrial and Uchida Yoko.
Fujitsu FACOM V
Fujitsu, Japan
UniFLEX
1970s
Unix-like OS from TSC for DMA-capable, extended addresses, Motorola 6809 based computers; e.g. SWTPC, GIMIX and others.
Motorola 6809
Technical Systems Consultants (TSC), USA
Unics
1969
Uniplexed Information and Computing Service. Later Unix. AT&T, initially on DEC computers.
-
AT&T, USA
Unicos
1985
Name of a range of Unix-like operating system variants developed by Cray for its supercomputers. UNICOS is the successor of the Cray Operating System (COS).
Cray-1, Cray-2
Cray, USA
uNETix
1980s
Network OS for the 8086, 68000, & 16032 families. Multitasking with transparent remote file access, load balancing, and multiple windows. UNIX and PC-DOS compatible.
i8086, 68000, & 16032 families
Lantech Systems, USA
-
UMMPS
1974<
Virtual machine system for the IBM 360/67.
IBM System/360-67
USA
-
UMIPS (1 versions)
1986
MIPS Computers' first operating system, a port of Berkeley's BSD4.3 version of UNIX.
RISC CPU
MIPS Computer Systems, USA
UMES
1958
University of Michigan Executive System. Batch operating system.
IBM 704, 709, and 7090
IBM, USA
UMD
1980s
Operating system for 8080, 6800, 68000, Z8000 series, and others.
i8080, 6800, 68000, Z8000
Boston Systems Office, USA
-
Ultrix (1 versions)
1982
Brand name of Digital Equipment Corporation's (DEC) discontinued native Unix operating systems for the PDP-11, VAX and DECstations.
PDP-11, VAX and DECstation
DEC, USA
ULTRADOS
1980
Originally called Level IV DOS. Operating system for the Tandy TRS-80 Level IV Products.
Tandy TRS-80
Vernon Hester, USA
Ultimate
1978
Version of PICK.
-
The Ultimate Corp., USA
uKOS
1992
Multi-tasking OS suitable for small embedded µController systems.
Cortex-M3-M4-M7-H7, 6833x, PIC, CSEM icyflex-1, STM32
Edo Franzi, Switzerland
udos (2)
2004c
Micro disk operating system for PC/AT compatibles with legacy floppy drive.
x86
K. Gondow and M. Ohba, Japan
uDOS (1)
2006c
Free operating system built on the FreeDOS kernel with DJGPP.
x86
B. Decker
UCSD p-System
1978
Portable complete programming environment/operating system/virtual machine developed by a long running student project at UCSD.
Apple II
University of California San Diego, USA
UCLA VM
1974<
Virtual machine system developed at UCLA for modified PDP-11/45 for data security studies.
DEC PDP-11/45
UCLA, USA
-
UCLA Secure UNIX
1979
Early secure UNIX OS based on security kernel.
-
UCLA, USA
Ubuntu Touch
2011
Also known as Ubuntu Phone. Mobile version of the Ubuntu operating system that was originally developed by Canonical and is now being developed by the UBports community.
ARM
Canonical, UK
Ubuntu Kylin
2013
Canonical agreement with the Ministry of Industry and Information Technology of the People's Republic of China to release an Ubuntu-based Linux OS.
-
Canonical, UK
-
Ubuntu (28 versions)
2004
Free and open-source operating system and Linux distribution based on Debian.
IA-32, AMD64, ARMhf (ARMv7 + VFPv3-D16), ARM64, OWER8 (ppc64el), s390x
Canonical, Ubuntu community, UK
u-velOSity
1990s
Family of real-time operating systems.
ARM Cortex, MPC
Green Hills Software, USA
TYMNET
1971
Operating system for the Tymnet network.
SPC-12, SDS-940, Varian 620
Tymes, USA
TX990/TXDS
1977<
Terminal Executive Development System. Proprietary operating systems for TI-990 minicomputers.
TI-990
Texas Instruments, USA
TWOS
1984c
Time Warp Operating System. OS developed for the Mark III Hypercube multiprocessor, primarily to support asynchronous discrete event simulation. Synchronizes events by unlimited process rollback.
Mark III Hypercube multiprocessor
Caltech Jet Propulsion Laboratory, USA
tvOS (13 versions)
2015
Operating system developed by Apple for the fourth-generation and later Apple TV digital media player.
Apple TV
Apple, USA
TurboDos
1980s
Enhanced multitasking version of CP/M for Z80 and 8086.
Z80 and i8086
Software 2000, USA
-
TurboDOS
1982
Multi user CP/M like operating system for the Z80 and 8086 CPUs.
Z80, i8086
Software 2000, USA
Turbo-DOS
1990s
One of the primitive operating systems for BK-0010 and BK-0010-01, ideologically close to KMON . File system is not compatible with anything.
Elektronika BK-0010
Russia
TUNIS
1983<
Toronto University System. Unix-like operating system. TUNIS was a portable operating system compatible with Unix V7, but with a completely redesigned kernel, written in Concurrent Euclid.
DEC PDP-11, Motorola 6809 and 68000, and National Semiconductor 32016
University of Toronto, Canada
TUD:OS
2000s
TU Dresden Research Operating System.
ARM, IA-32, x86-64
TU Dresden, Germany
TTP
1998c
Operating System with many unique, innovative features including Pre-emptive Timeslicing, and Dynamic Multitasking. See Raven.
x86
PiSig Innovations Lab., USA
TSX-PLUS
1984<
RT-11 compatible multitasking, multiprocessing OS for PDP-11 family.
DEC PDP-11
S&H Computer Systems, USA
-
TSX-32
1989
General purpose 32-bit multi-user multitasking operating system for x86 architecture platform, with a command line user interface. It is compatible with some 16-bit DOS applications and supports file systems FAT16 and FAT32.
x86
S&H Computer Systems, USA
TSX
1967c
Time Sharing eXecutive.
IBM 1800
IBM, USA
TSS/360
1967
IBM's Time-sharing System for the S/360-67. Never officially released, canceled in 1969 and again in 1971.
IBM System/360-67
IBM, USA
TSS-8
1968
Discontinued time-sharing operating system. DEC also referred to it as Timeshared-8 and EduSystem 50.
DEC PDP-8
DEC, USA
TSS (2)
1974<
Timesharing OS for General Automation System 18/30.
General Automation System 18/30
USA
-
TSS (1)
1964<
Early timesharing system for the AN/FSQ-32.
AN/FSQ-32
USA
-
TSOS
1965
Time Sharing Operating System. First OS supporting virtual addressing of the main storage and support for both timeshare and batch interface. Renamed VMOS.
RCA mainframes
RCA, USA
TSM
1964<
Time Sharing Monitor. Early timesharing OS for the 7090.
IBM 7090
IBM, USA
-
TS8/E
1974<
Timesharing OS for the DEC PDP-8.
DEC PDP-8
USA
-
TrustedBSD
2000
Unix-like OS of the BSD family which provides a set of trusted operating system extensions to the FreeBSD operating system, targeting the Common Criteria for Information Technology Security Evaluation (CC).
-
Robert Watson, USA
Trusted Solaris
1995
Solaris with kernel and other enhancements to support multilevel security.
Sun workstation
Sun Microsystems, USA
TrueOS
2006
Previously known as PC-BSD. Unix-like, server-oriented operating system built upon the most recent releases of FreeBSD-CURRENT.
amd64, armv7
iXsystems, USA
TRSDOS (6 versions)
1978
Floppy-disk-oriented OS supplied by Tandy/Radio Shack for their TRS-80 Z80-based line of personal computers. Eventually renamed as LS-DOS or LDOS.
Tandy TRS-80
Randy Cook, Tandy, USA
TRON
1984
The Real-Time Operating System Nucleus. Specification for a family of real-time operating systems and an associated CPU architecture.
-
TRON Project, University of Tokyo, Japan
TRIX
1978c
Network oriented OS.
-
USA
-
TripOS
1978
TRIvial Portable Operating System.
DEC PDP-11, Computer Automation LSI4, Data General Nova, Motorola 68000, i8086, Cintcode BCPL (VM)
University of Cambridge, University of Bath, MetaComCo, UK
TRIPOS
1979<
Portable OS for Minicomputers. PDP-11, 68000 series, 32000 series.
DEC PDP-11, 68000, 32000 series
USA
-
TRIO
1970s
Operating system for three users, written in Concurrent Pascal, based on SOLO.
DEC PDP-11/55
Per Brinch Hansen, USA
-
Trampoline
2000s
Static RTOS for small embedded systems. Its API is aligned with OSEK/VDX OS and AUTOSAR OS 4.2 standards.
AVR, H8-300H, POSIX, NEC V850e, ARM7, Infineon C166, HCS12 or PowerPC
LS2N (ex-IRCCyN) Laboratory, France
TR-DOS
1984
Disk operating system for the ZX Spectrum with Beta Disc and Beta 128 disc interfaces.
ZX Spectrum
Technology Research, UK
TPF
1979
Transaction Processing Facility. IBM real-time operating system for mainframe computers descended from the IBM System/360 family, including zSeries and System z9.
IBM System/360, System/370, IBM z Series
IBM, USA
TP/M
1980s
Version of CP/M for the Epson QX-10.
Epson QX-10
Epson, Japan
-
Towns OS
1990s
Graphical OS called Towns OS, based on MS-DOS and the Phar Lap DOS extender.
Fujitsu FM Towns
Fujitsu, Japan
Total OA Processor
1985
Operating Systems for the TOSBAC Q Series.
Toshiba TOSBAC Q series
Toshiba, Japan
Toshiba 4690 OS
1993
POS operating system based on IBM 4690 OS and FlexOS.
POS terminal devices
Digital Research, USA
TOSBAC-1350 SO
1973
First-Generation Operating Systems for the TOSBAC-1350.
Toshiba TOSBAC-1350
Toshiba, Japan
TOSBAC-1150 System IV
1974
First-Generation Operating Systems for the TOSBAC-1150 office computer.
Toshiba TOSBAC-1150
Toshiba, Japan
TOSBAC-1100E OS
1968
First-Generation Operating Systems for the TOSBAC-1100E office computer.
Toshiba TOSBAC-1100E
Toshiba, Japan
TOS/360
1965
IBM's Tape Operating System. Similar to BOS above and more fleeting, able to boot and run from 2x00 series tape drives.
IBM System/360
IBM, USA
TOS (5)
1980s
Teradata Operating System.
Teradata DBC/1012
Teradata, USA
-
TOS (4)
1985
Operating system for the Atari 520ST and 1040ST. Derived from Concurrent 68K.
Atari 520ST and 1040ST
USA
-
TOS (3)
1965c
Tape Operating System. Early operating system for the RCA Spectra 70.
RCA Spectra 70
USA
-
TOS (2)
1974<
Teletype Operating System for the Microdata 1600 & 3200 minicomputers.
Microdata 1600 & 3200
USA
-
TOS (1)
1965>
Tape OS.
Hitachi HITAC 8000
Hitachi, Japan
-
Torsion
2000s
Single address-space (SAS) OS with orthogonal persistence
-
Dan Helfman
Topsy
1990s
Eucational OS. It is a small multi-threaded message-based microkernel written in ANSI C and running on a R3000 simulator written in Java.
-
ETH Zurich, Switzerland
TOPS-20
1976
Proprietary OS used on some of DEC's 36-bit mainframe computers.
DEC PDP-10
DEC, USA
TOPS-10 (4 versions)
1964
Timesharing/Total Operating System-10. Discontinued operating system from DEC for the PDP-10 (or DECsystem-10) computer family.
DEC PDP-10, PDP-6
DEC, USA
Tock OS
2000s
Embedded operating system designed for running multiple concurrent, mutually distrustful applications on low-memory and low-power microcontrollers.
ARM Cortex
-
ToaruOS
2017
Japanese roughly equivalent to 'a certain'. Hobby operating system and kernel developed largely independently (notably contrary to most modern OSes.
x86
Kevin Lange
TNKernel
2000s
compact and very fast real-time kernel for the embedded 32/16/8 bits microprocessors.
ARM, PIC24-32-dsPIC, HCS08, STM32 (Cortex-M3)
Yuri Tiomkin, Russia
TNeo
2000s
Compact and fast real-time kernel for embedded 32/16 bits microprocessors.
Cortex-M0-M0+-M1-M3-M4-M4F, PIC24-32-dsPIC
Russia
TMX
1980s
Transaction Management eXecutive. NCR Corporation's proprietary transaction processing system running on NCR Tower 5000-series systems which were based on Motorola 680xx CPUs.
NCR Tower 5000
NCR, USA
TMS
1973<
Magnetic tape operation system based on 4K disk monitor system (DMS), but reconfigured to improve speed and performance on a magnetic tape.
DEC PDP-8
DEC, USA
-
TME (1 versions)
1980
Transaction Machine Environment. was the operating system on the ME29 and required CL (Control Language) to run jobs - 'manual' operation being discouraged.
ICL ME29 minicomputer
ICL, UK
TMaxOS
2009
South Korean OS based on Windows.
-
TmaxSoft, Korea
TizenRT
2017
Lightweight RTOS-based platform to support low-end IoT devices.
ARM
-
Tizen
2012
Earlier called LiMo Platform. Operating system based on the Linux kernel, a project within the Linux Foundation and is governed by a Technical Steering Group (TSG) while controlled by Samsung and backed by Intel. Tizen works on a wide range of Samsung devices including smartphones, tablets, smart TVs, PCs and wearable.
ARM, ARM64 x86, and x86-64
Samsung Electronics, The Linux Foundation, Korea
TITAN Supervisor
1963
Early time-sharing system.
Atlas 2
Queen's University of Belfast, UK
-
Titan File System
1967
Timesharing operating system for the Titan.
-
Cambridge University, UK
-
TinyOS
2000
Embedded, component-based operating system and platform for low-power wireless devices, such as those used in wireless sensor networks (WSNs), smartdust, ubiquitous computing, personal area networks, building automation, and smart meters.
-
TinyOS Alliance
TINOS
1990s
Small, multipurpose OS that could be used as a learning tool for the author and anyone else that cared to use it.
-
Bart Sekura
TiMOS
1990s
Used in routers from Alcatel-Lucent.
Alcatel-Lucent routers
Alcatel-Lucent, France
Tigger
1990s
Project to develop an OS and framework for the construction of a family of distributed object-oriented platforms.
-
Trinity College Dublin, Ireland
TI-RTOS Kernel
1985
Real-time operating system for TI's embedded devices.
Texas Instruments TMS320 DSPs, ARM, MSP430
Texas Instruments, USA
ThreadX
1997
Highly deterministic, embedded real-time operating system.
ARC, ARM, Blackfin, CEVA, C6x, MIPS, NXP, PIC, PowerPC, RISC-V, RX, SH, SHARC, TI, V850, Xtensa, x86 and others
Express Logic, USA
Thoth
1978c
Real-time operating system which is designed to be portable over a large set of machines.
-
University of Waterloo, Canada
Thix
1994
Deceased project of a Unix OS implementation written from scratch for the purpose of learning.
-
Tudor Hulubei, USA
THEOS
1977
Operating system which started out as OASIS, a microcomputer operating system for small computers that use the Z80 processor.
Z80 microcomputers
Phase One Systems, USA
THE
1968
Multiprogramming system by Dijkstra. Introduced the first form of software-based memory segmentation, freeing programmers from being forced to use actual physical locations.
Electrologica X8
Eindhoven University of Technology, Netherlands
-
TENEX
1969
Ancestor of TOPS-20 from BBN, for the PDP-10.
DEC PDP-10
DEC, USA
-
Ten15
1980s
Algebraically specified abstract machine. Successor of Flex machine.
-
Royal Signals and Radar Establishment, Malvern, UK
TempleOS
2013
Formerly J Operating System, SparrowOS and LoseThos. Biblical-themed lightweight operating system designed to be the Third Temple prophesied in the Bible.
x86-64
Terry A. Davis
TDOS
1965>
Tape and Disk Operating System.
Hitachi HITAC 8000, RCA Spectra 70
-
-
Tauon
2000s
Based on oCos. See Lepton.
ARM9, ARM7, CortexM3, CortexM4
Philippe Le Boulanger, France
TASIS
1990s
Modern version of IS-DOS.
ATM Turbo 2+
NedoPC, Russia
TargetOS
2015c
Full-featured real-time operating system designed specifically for embedded applications.
ARM, Cortus, Freescale ColdFire, PowerPC
Blunk Microsystems, USA
Tape Scope 2
1974<
Tape based OS derived from SCOPE for the CDC System 17.
CDC System 17
USA
-
Tao OS
1990s
Now called Elate.
-
-
Talon DSP RTOS (5 versions)
2000s
Suite of five POSIX Compliant Real Time Operating Systems that are individually optimized for each TI DSP family.
TMS320
Blackhawk, USA
Taligent
1990s
Object-oriented operating system. Initially started as a project within Apple to provide a replacement for the classic Mac OS, it was later spun off into a joint venture with IBM as part of the AIM alliance, with the purpose of building a competing platform to Microsoft Cairo and NeXTSTEP. Replaced by Copland and IBM CommonPoint.
Apple Macintosh
Apple, USA
TAJ
2000s
TAJ is India's first object oriented operating system. Its developed in C++. The code is well modularised & maintain. TAJ is a multitasking, multithreading and multiuser operating system.
-
Viral Patel, India
-
Tabos
2004
Tabos is a new operating system based on a modular monolithic kernel with module loading support, using the x86 platform features.
x86
Jan-Michael Brummer, Germany
T.H.E.
1968c
Research OS developed by Edsgar Dijkstra. Named for the Technische Hoogeschool at Eindhoven, where it was developed. Early exploration of program verification techniques. Early layered system design. First implementation of semaphores.
-
Technische Hoogeschoo, Netherlands
-
T-Kernel
2002
Open source real-time operating system designed for 32-bit microcontrollers. It is standardized by the T-Engine Forum, which distributes it under a "T-License" license agreement.
ARM, MIPS, SH
T-Engine
System/88 Operating System
1987
IBM version of Stratus/32 OS.
IBM System/88
IBM, Stratus Computer, USA
-
SysPak OS
2005
Microkernel based multiprocessor, multitasking, multithreading operating system for the IBM-PC Intel i386 systems. It is developed in Department of Computer Science of Bahahuddin Zakariya University, Multan Pakistan.
i386
Bahahuddin Zakariya University, Multan, Pakistan
SYSEX
1972<
System Executive. A time-sharing monitor for SIGMA/2 and small IBM S/360 computers.
SIGMA/2 and small IBM S/360
USA
-
SYS
1962
Operating system for the Philco-2000 computer.
Philco 2000
Philco, USA
-
Synthetix
1990s
OGI's Synthetix project of fine-grained incremental partial evaluation in OS kernels, using a combination of highly isolated system components, and dynamic code generation. Sponsored by ARPA, Intel, and Hewlett-Packard.
-
OGI School of Science and Engineering, USA
Synthesis
1990s
The first of the modern OS that dynamically generated code at runtime. Although it was written in MC68000 assembly, it opened the path to projects like Aegis and Synthetix.
Synapse N+1 system
Henry Massalin, USA
Symobi
2002
SYstem for MOBIle applications. proprietary modern and mobile real-time operating system. Designed for the area of embedded and mobile systems.
-
Miray Software, Germany
SymbOS
2006
SYmbiosis Multitasking Based Operating System. GUI based modern micro-kernel OS for x86, ARM and PowerPC processors. Used and developed further at Technical University of Munich.
Amstrad, Z80 microcomputers
Miray Software, UK
Symbian platform
2009
Successor to Symbian OS.
-
Symbian, UK
Symbian OS
1997
Discontinued mobile operating system and computing platform designed for smartphones.
ARM?, ?x86 computers
Symbian, UK
Syllable Desktop
2002
Modern, independently originated OS. See AtheOS.
IA-32
K. Van Der Vliet, K. de Vos, R. Caudill, A. Klenke, H. Isaksson, UK
Switch Light OS
2010c
Complete SDN operating system based on Open Network Linux (ONL), an open source effort within the Open Compute Project.
-
Big Switch Networks, USA
SwarmOS
1990s
Pretty standard, kernel based OS, but that actually boots and works to some extent.
-
-
SVS
1970s
Single Virtual Storage. Refers to Release 1 of Operating System/Virtual Storage 2 (OS/VS2); it is the successor system to the MVT option of Operating System/360.
IBM System/360, System/370
IBM, USA
SVM ES (3 versions)
1982
Sistema Virtual'nykh Mashin. IBM VM/370 clone.
RIAD ES
Russia
SUSE Linux Enterprise Server 15
2018
-
-
-
-
SUSE Linux Enterprise Server 12
2014
-
-
-
-
SUSE Linux Enterprise Server 11
2009
-
-
-
-
SUSE Linux Enterprise Server 10
2006
-
-
-
-
SUSE Linux Enterprise Server (SLES) (7 versions)
2000
Designed for servers, mainframes, and workstations but can be installed on desktop computers for testing as well.
IA-32, x86-64, s390x, PowerPC, Itanium, aarch32, aarch64
SUSE, Germany
SUSE Linux (7 versions)
1994
Linux distribution.
-
SUSE, Germany
SuperDOS
1980s
CP/M 2.2 with SuperDOS as BDOS replacement.
Altair
USA
SUPER-UX
1990s
Port of System V Release 4.2MP with features adopted from BSD and Linux for NEC SX architecture supercomputers.
NEC SX supercomputers
USA
SunOS (12 versions)
1983
BSD-based Unix system used on early Sun hardware.
-
Sun Microsystems, USA
SUNIX
1980s
Version of UNIX for Z8002.
Z8002
SGS-Ates, Italy
-
SUN
1984<
General Purpose OS kernel for the HP 9000 Series 500.
HP-9000 Series 500
USA
-
SUE
1968c
Experimental OS for the IBM S/360.
IBM System/360
USA
-
Stratus VOS
1982
Developed by Stratus, and used for IBM System/88, Original equipment manufacturer from Stratus.
IBM System/88, Stratus computers
IBM, USA
-
STRATUS
1980s
Operating system for Stratus-32 Computers.
Stratus-32
Stratus Technologies, USA
-
Stratify OS
2000s
Microcontroller operating system designed to bring the software innovation model that has made computers and smartphones enormously successful to microcontroller hardware.
ARM Cortex-M3, M4
Statify Labs, USA
StormOS
2000s
Desktop focused distribution based on Nexenta Core Platform 2.0.
x86-64
Andrew Stormont
STOP (2 versions)
1983
Secure Trusted Operating Program. Monolithic kernel operating system. Though it provides a Linux-compatible API, STOP is not derived from Unix or any Unix-like system. TCSEC A1-class, secure OS for SCOMP hardware.
SCOMP processor
BAE Systems, USA
Sting
1992c
Experimental operating system designed to serve as an efficient customizable substrate for modern programming languages.
-
-
Stella
1990s
Real time operating system. It runs on 680x0 processors and may be adapted to ColdFire processors. Although designed for embeded systems, it could be easily extended to run on any computer system.
68000
Tony Tebby, France
Static OS
2000s
Live CD protected-mode OS.
x86
Stefan Mayer, Austria
StateOS
2000s
Free, extremely simple, amazingly tiny and very fast real-time operating system (RTOS) designed for deeply embedded applications.
ARM Cortex-M, STM8
-
STARPLEX II
1980s
Realtime OS for the Z80A.
Z80A
National Semiconductors, USA
StarOS
1978c
One of two major operating systems developed for the Cm* multiprocessor. Based on concept of task forces.
Cm Multiprocessor
Carnegie-Mellon University, USA
-
Star User Interface
1982
Graphical user interface for the Xerox Star.
Xerox Star
Xerox, USA
-
SSP
1977
System Support Program. operating system for the IBM System/34 and System/36 minicomputers. SSP was a command-based operating system.
IBM System/34 and System/36
IBM, USA
-
SSB-DOS
1970s
Smoke Signal Broadcasting. A variant of FLEX in most respects.
-
TSC ?, USA
-
SROS
2000s
Service Router Operating System. Based on VxWorks.
Alcatel-Lucent routers
Alcatel-Lucent, USA
Sprite
1990s
Distributed operating system that provides a single system image to a cluster of workstations.
DECstation 5000/200 or a SparcStation 2
U.C. Berkeley, USA
Spring
1993
Distributed multiplatform OS. Not related to the Spring Kernel, a real-time system.
Sun workstation
Sun Microsystems, USA
Spoon
1990s
Operating system based on a microkernel.
-
South Africa
SPIRAL
1970
Small general-purpose computer operating system together with extra functions, such as kana-enabled COBOL, suited for office-computer applications that aimed to be user friendly.
Fujitsu FACOM 230
Fujitus, Japan
SPIN
1994
Extensible OS written in Modula-3.
-
University of Washington, USA
SPHERE
1980s
Real-time, ROM-based development system.
-
Infosphere, USA
-
SpartaDOS X
1988
Aka SpartaDOS 4.0. Disk operating system for the Atari 8-bit family of computers that closely resembles MS-DOS.
Atari 8-bit family
ICD, Fine Tooned Engineering, USA
Space
1990s
Approach to operating systems which uses multiple protection domains rather than a single kernel to provide operating system services.
-
University of Santa Barbara, USA
SOS (4)
1989c
SOMIW Operating System. Object-oriented operating system implemented on top of UNIX.
-
INRIA, France
SOS (3)
1980c
Sophisticated OS for the Apple III.
Apple III
USA
-
SOS (2)
1974<
Standalone OS for Data General Nova & Supernova.
Data General Nova & Supernova
USA
-
SOS (1)
1959
SHARE Operating System. Improvement on the General Motors GM-NAA I/O operating system, the first operating system.
IBM 704, 709
SHARE user group, USA
SOOS Project
2000s
Server Oriented Operating System. Operating system (OS) specially designed for embedded systems.
Hitachi H8/300
David Donari, Leo Ordinez, Rodrigo Santos, Brazil
SOLO
1975
Single-User Research Operating System. Written in Concurrent Pascal, to demonstrate its concurrency mechanism at the California Institute of Technology.
DEC PDP-11/45
Per Brinch Hansen, USA
Solar_OS
2002
Simple, easy, fast realtime 32bit GUI OS.
-
Bogdan Ontanu, Romania
Solaris (20 versions)
1992
System V-based replacement for SunOS.
-
Sun Microsystems, USA
Softlanding Linux System (SLS)
1992
One of the first Linux distributions.
-
Peter MacDonald, Canada
SODS/OS
1970s
Operating system for a Distributed System developed on the IBM Series/1.
IBM Series/1
Univeristy of Delaware, USA
-
SODA
1985c
Simplified OS for Distributed applications.
-
USA
-
SOC
1972
-
-
M. M. Somia, USA
-
SMSQ/E
1990s
Born from the fusion of SMSQ and of the level "E" (thus the name) device drivers first developped for the Atari QL emulator sold by Jochen Merz Software.
Sinclair QL
Tony Tebby, France
SMSQ
1990s
Full re-write of QDOS. Developped from SMS2 for the Miracle systems' QXL card.
Sinclair QL
Tony Tebby, France
SMS2
1990s
Derivative from QDOS running on Atari computers in monochrome mode (640x400). It does not get any BASIC interpreter. "SMS" should stand for Small Multitasking System or Small Machine System.
Atari 8-bit family
-
SmartOS
2000s
Illumos distribution for cloud computing with Kernel-based Virtual Machine integration.
x86-64
Joyent, USA
SLK
1990s
Safe Language Kernel Project. OS infrastructure for extensible systems.
-
Cornell University, USA
-
Slackware (10 versions)
1993
Linux distribution.
IA-32, x86-64, ARM
Patrick Volkerding
SkyOS
1997
Commercial desktop OS for PCs.
IA-32
Robert Szeleney
SIRIS (4 versions)
1970
Operating system for CII 1070 and IRIS computers.
CII computers
Compagnie internationale pour l'informatique, France
-
SIRENA
1971
Time-sharing operating system for airline reservations.
-
Russia
-
SIPROS 66
1965
Simultaneous Processing Operating System.
CDC 6600
Control Data, USA
SINTRAN (2 versions)
1968
Range of operating systems for Norsk Data's line of minicomputers.
Norsk Data computers
Norwegian Institute of Technology, Norsk Data, Norway
SINIX
1984
Port by SNI of Unix to the MIPS architecture.
MIPS
Siemens Nixdorf, Germany
Singularity (2 versions)
2007
Research operating system written mostly in managed code (C#).
-
Microsoft, USA
Sinclair QDOS
1984
Multitasking operating system found on the Sinclair QL personal computer and its clones.
Sinclair QL
Sinclair, UK
Simulink Real-Time
1990s
Formerly known as xPC Target. Environment for simulating and testing Simulink and Stateflow models in real-time on the physical system.
x86
MathWorks, USA
SimpleAVROS
2000s
RTOS designed special for AVR microcontrollers.
AVR only
Miki Tebeka
Simba
2000s
Embedded Programming Platform.
Arduino Nano (AVR), Arduino Mega (AVR), Arduino Due (ARM), ESP8266, ESP32, cygwin/linux
Erik Moqvist, Sweden
silRTOS
2000s
Open source micro real time kernel.
ARM, Cortex-M3 Cortex-A9 ARM-11MP, Blackfin, MIPS, AVR
SpanIdea, USA
SilkOS
1990s
Lisp environment atop Unix .
-
Kelly Murray
SILK
2003c
Scout in Linux Kernel. Linux kernel module which transforms a standard Linux OS into Scout.
-
University of Princeton, USA
SIGMA 7 OS
1965c
Operating system for the SDS Sigma 7 real-time data processing computer.
SDS Sigma 7
USA
-
Siemens S5-DOS/MT
1980s
Industrial control system based on FlexOS.
-
Digital Research, USA
ShawnOS
1990s
Small OS, written in 3 months entirely in assembly, that is functional enough to run programs.
-
Brian Klock
SharpOS
2008
Computer operating system based on the .NET Framework and related programming language C#.
x86
SharpOS Project
SHaRK
2000s
Soft Hard Real-time Kernel. Completely configurable kernel architecture designed for supporting hard, soft, and non real-time applications with interchangeable scheduling algorithms. Evolution of the Hartik Kernel and it is based on the OSLib Project.
-
Sant'Anna School of Advanced Studies, Pisa, Italy
ShagOS
1990s
Object Oriented system based on a message passing kernel.
-
Frank Barrus
SerIX
1985<
Unix on Series/1. CMI version of AT&T's UNIX System V OS.
IBM Series/1
CMI
SEOS
2000s
SmartEdge Operating System.
-
Ericsson, Sweden
-
SEL 810A/810B OS
1968c
Batch Serial Operating System for the SEL 810A/810B minicomputer.
SEL 810A/810B
USA
-
SEIUX
1990s
Mostly a clone of the RISC/os.
Sumistation
Sumitomo Electric, Japan
-
SDPOS
2000s
Small Devices Portable Operating System. Mini operating system providing basic scheduling services (cooperative and real time modes) and an hardware abstraction layer enabling the user to quickly developp embedded applications minimizing the need to learn specific processor architectural details.
ARM, Cortex-M3, Blackfin, PIC18, PIC24, i386 win32/linux synthetic targets
-
SDOS
1980s
Operating System for 6809.
M6809
Software Dynamics, USA
-
ScreenOS (4 versions)
1990s
Real-time embedded operating system for the NetScreen range of hardware firewall devices from Juniper Networks.
NetScreen
Juniper Networks, Netscreen
SCP-DOS
1980s
DOS acquired by Bill Gates to create MS_DOS. See 86-DOS.
IBM PC compatibles
Seattle Computer Products, USA
-
SCP-2
1970s
Secure Operating System (DOD A1/B3) Multilevel security.
GEC 4000 series
DEC, USA
SCP (2)
1973
System Control Program. Basic OS for the Burroughs B700 series.
Burroughs B700 series, IBM System/3
USA
-
SCP (1)
1964
Supervisory Control Program.
DEC PDP-6
GEC Computers, USA
-
Scout
1990s
Operating system specifically aimed at network appliances (webcams, ip routers).
Digital Alpha and Intel Pentium
University of Arizona, USA
SCOPE (7 versions)
1964
Supervisory Control Of Program Execution or Simultaneous Control Of Program Execution. File-oriented system using mass storage, random access devices. Productized version of Chippewa.
CDC 3000/6000/7600 series
Control Data, USA
SCO UNIX (1 versions)
1989
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 Group, USA
SCO OpenServer 5
1995
AT&T UNIX System V Release 3 based.
-
Samsung Electronics
SCO OpenServer
1989
Aka Xinuos OpenServer, previously SCO UNIX and SCO Open Desktop (SCO ODT), is a closed source computer operating system developed by Santa Cruz Operation (SCO), later acquired by SCO Group, and now owned by Xinuos.
-
SCO Group, USA
SCO Open Desktop
1990s
The first 32-bit graphical user interface for UNIX Systems running on Intel processor-based computers. Based on SCO Unix.
-
Samsung Electronics, Korea
-
scmRTOS
2000s
Tiny Real-Time Preemptive Operating System intended for use with Single-Chip Microcontrollers.
ARM, Cortex-M3, Blackfin, MSP430, AVR, STM8
Russia
SCIOPTA
1990s
Pre-emptive, priority-based direct message passing real-time kernel.
ARM, Cortex-M0-M3-M4, Cortex-R4, Cortex-A5, Cortex-A7, Cortex-A9, Cortex-A53, XScale, Renesas RX100, RX200, RX600, RX700, PowerPC, ColdFire, HCS12, M16C, Aurix TC2xx, BlackFin BF52x, BF70x
Sciopta Systems, Switzerland
SchilliX
2005
OpenSolaris based complete open-source operating system.
x86, x86-64
Germany
schemix
1990s
Implementation of (a subset of) Scheme that runs inside the Linux Kernel OS, so you can dynamically debug your device-drivers.
-
-
Schema
1990s
Operating system and operating environment written in Scheme atop a virtual machine which provides an abstraction layer between the hardware and the operating system, implying ease of porting between widely varying processors and other hardware.
-
-
-
SAX
1974<
Real time OS for Mod Comp Computers.
ModComp Computers
USA
-
Sartoris Microkernel
2000s
Portable microkernel and a set of operating system services.
x86
Nicodega
Sanos
2002
Minimalistic 32-bit x86 operating system kernel for network server appliances running on standard PC hardware.
IA-32
Michael Ringgaard
SAN-OS
1990s
Now NX-OS.
-
Cisco Systems, USA
-
Sailfish OS
2013
General purpose Linux distribution used commonly as a mobile operating system combining the Linux kernel for a particular hardware platform.
32-bit ARM and 64-bit x86
Jolla, Finland
Saguaro
1985c
Distributed OS supporting varying degrees of transparency.
-
Univeristy of Arizona, USA
-
SAGE
1950s
Semi-Automatic Ground Environment system. Control Program for IBM AN/FSQ7 to monitor weapons systems. First real-time control system.
IBM AN/FSQ7
IBM, USA
-
safeRTOS
2000s
Complementary version of FreeRTOS, with common functionality but designed specifically for safety-critical implementation.
ARM, AVR, AVR32, ColdFire, HCS12, IA-32, Cortex-M3-M4-M7, MicroBlaze, MSP430, PIC, PIC32, Renesas H8/S, RX100-200-600-700, 8052, STM32, EFM32
Wittenstein High Integrity Systems, Real Time Engineers Ltd., UK
SABRE
1960s
Semi-Automatic Business Related Environment. The first major transaction processing system, developed by IBM and American Airlines for the IBM 7090.
IBM 7090
IBM, USA
-
S5
1980s
Operating system for the ALTOS computer (?).
ALTOS computer
USA
-
S1
1985c
Modular building block OS adaptible to various configurations. 8080, 8086 and 68000 families.
i8080, i8086 and 68000
Multi-Solutions, USA
-
S-OS
1986
Minimal DOS for Z80 machines.
Sharp, NEC, MSX, Z80
Japan
RxDOS
1990s
Commercial DOS clone as described and available in the author's book "Dissecting DOS".
-
Mike Podanovsky
RX616
1980s
See I-TRON.
NEC V60, NEC V70
NEC, Japan
RX116
1980s
See I-TRON.
NEC V20, NEC V30, NEC V40, NEC V50
NEC, Japan
RX-UX832
1980s
See Mustard.
NEC V60, NEC V70
NEC, Japan
Rx
1978c
Real time executive for the Texas Instruments TMS9900.
Texas Instruments TMS9900
USA
-
Ruff
2016
IoT operating system, using JavaScript as its programing language.
ARM, MIPS, x86
Ruff team
RUDOS
1980s
Soviet RT-11 clone.
Elektronika MS 0511
Russia
-
RTXC
1970s
Quadros RTOS proprietary C-based RTOS used in embedded systems.
ARM - Atmel/Freescale/NXP/ST/TI, Blackfin, 680x0-ColdFire, PowerPC, StarCore, TI-Luminary Stellaris, TI OMAP, XScale
AT Barrett and Associates, Quadros Systems, USA
RTX-16
1970
Realtime executive for General Automation System 18/30.
General Automation SPC-16, Honeywell Series 16
General Automation, USA
-
RTX Keil Real-Time Operating System
2000s
Deterministic Real-Time Operating System designed for ARM and Cortex-M devices. Now part of Arm Holding.
ARM
Keil Elektronik, Germany
RTX (1 versions)
1995
Line of real-time operating system (RTOS) extensions. They are a software extension or abstraction layer that converts Microsoft Windows operating system into a RTOS. It was the first Windows real-time solution on the market.
x86, x86-32
IntervalZero, USA
RTUX
1980s
Real time OS based on Unix for 68000 based systems. Multiprocessing, multitasking, message driven.
68000
Emerge Systems, USA
-
RTTS
1984<
Real Time Task Scheduler. OS for August Systems Can't Fail 300 with triple 8086s, featuring high reliability.
August Systems
USA
-
RTS/8
1974
Compact real-time operating system designed for the PDP-8 family of processors.
DEC PDP-8
USA
RTR
1984<
Successor to DMERT for the AT&T 3B20 Duplex computer, featuring high reliability.
AT&T 3B20 Duplex computer
USA
-
RTOS/360
1969c
IBM's Real Time Operating System, ran on 5 NASA custom System/360-75s.
NASA custom IBM System/360-75s
IBM, USA
RTOS-16
1970
Real-Time OS.
Digico Micro-16V, General Automation SPC-16
General Automation, USA
-
RTOS (4)
2000s
Real-time operating system.
-
Force10 Networks, USA
RTOS (3)
1974<
Real time multiprogramming OS for Prime 100, 200, 300.
Prime 100, 200, 300
USA
-
RTOS (2)
1974<
Real time operating system for Data General Nova.
Data General Nova
USA
-
RTOS (1)
1974<
Real-Time Disk OS for Interdata Minicomputers.
Interdata Minicomputers
USA
-
RTMS
1974<
Realtime multiprogramming OS for General Automation System 18/30.
General Automation System 18/30
USA
-
RTMOS
1960s
Real-Time Multiprogramming Operating System. 24-bit process control operating system that supported both real-time computing and multiprogramming.
General Electric computers
General Electric, USA
rtmk
1990s
Free real-time microkernel OS sharing alot of ideas with Mach.
-
Johan Rydberg, Sweden
RTM8
1978c
Realtime executive for the AMC 95/4000.
AMC 95/4000
USA
-
RTLinux
2000s
Hard realtime real-time operating system microkernel that runs the entire Linux operating system as a fully preemptive process. The hard real-time property makes it possible to control robots, data acquisition systems, manufacturing plants, and other time-sensitive instruments and machines from RTLinux applications.
-
New Mexico Institute of Mining and Technology, USA
RTEX
1974<
Realtime executive for Interdata minicomputers.
Interdata minicomputers
USA
-
RTEMS
1993
Real-Time Executive for Multiprocessor Systems. Formerly Real-Time Executive for Missile Systems, and then Real-Time Executive for Military Systems. Real-time operating system designed for embedded systems.
ARM, Blackfin, ColdFire, TI C3x/C4x, H8/300, x86, 68k, LatticeMico32, MIPS, Nios II, PowerPC, SuperH, SPARC, ERC32, LEON, Mongoose-V
OAR, USA
RTE-A
1984<
Realtime Executive for HP-1000 A-series.
HP-1000
USA
-
RTE-6/VM
1984<
Realtime virtual memory OS for dual HP-1000s, featuring high reliability.
HP-1000
USA
-
RTE (4 versions)
1972c
Real-Time Exucutive. Realtime operating system for Hewlett-Packard HP-2000 series.
HP-2000
USA
-
RTAI
2000s
Real-time application interface. Real-time extension for the Linux kernel, which lets users write applications with strict timing constraints for Linux.
x86, ARM
Politecnico di Milano, Italy
RT/EMT
1970s
UNIX compatible OS for the PDP-11.
DEC PDP-11
Human Computing Resources, USA
-
RT-Thread
2000s
Open source scalable real-time operating system for embedded devices.
ARM, x86, MIPS, PowerPC, RISC-V, Andes
RT-Thread, China
RT-Thread
2000s
Open source real-time operating system for embedded devices.
ARM, ARM Cortex-M0-M3-R4-M4-M7, IA-32, AVR32, Blackfin, nios, PPC, M16C, MIPS (loongson-1b-1c, PIC32?xburst), MicroBlaze, V850, unicore32
Bernard Xiong & RT-Thread Team, China
RT-11 (11 versions)
1973
Single user OS.
DEC PDP-11
DEC, USA
RSX180
1980
Multi-user, multi-tasking, RSX-11M-like OS for Z80 and Z180 processors.
Z80 and Z180 processors
-
-
RSX-15
1971<
Real-time multitasking executive for DEC PDP-15.
DEC PDP-15
DEC, USA
-
RSX-11 (18 versions)
1972
Realtime multitasking executive for DEC PDP-11. Based on RSX-15.
PDP-11
DEC, USA
RSTS (2 versions)
1970
Resource System Time Sharing. Multi-user time-sharing operating system, initially developed by Evans Griffiths & Hart of Boston, and acquired by DEC for the PDP-11 series of 16-bit minicomputers.
DEC PDP-11
DEC, USA
RSEXEC
1973
Experimental, network-wide operating system allowing access to resources distributed on various hosts on the ARPANET based principally on TENEX. The concept have been implemented in the National Software Works (NSW).
-
R.H. Thomas, USA
-
RPS (2 versions)
1978c
Real-time Programming System. Real-time interactive operating system for the IBM Series/1, based on MSP/7 and MPX/1800.
IBM Series/1
IBM, USA
RouterOS
1990s
Operating system of MikroTik RouterBOARD hardware based on Linux kernel.
RouterBOARD
Mikrotik
Roscoe
1978c
Distributed OS for multiple identical processors (LSI-11s).
NEC LSI-11
University of Wisconsin, USA
-
ROS (2)
1980s
Operating system with Ada Support.
i8086, 68000
Telesoft, USA
-
ROS (1)
1969
Operating system for small-to-medium scale real-time processing.
Fujitsu FACOM 230 and 235
Fujitsu, Japan
-
ROM-DOS
1989
Sometimes called Datalight DOS.
-
Datalight, USA
rojan
1990s
Was SamOS. An OS with a virtual reality based UI.
-
Ramon van Handel, USA
-
RODOS
2000s
Realtime Onboard Dependable Operating System. Real-time operating system for embedded systems and was designed for application domains demanding high dependability.
ARMv7 (M3, A8, A9), AVR32, PowerPC 405, sparc64
German Aerospace Center, Germany
RockBox
2002
Free and open-source software replacement for the OEM firmware in various forms of digital audio players (DAPs) with an original kernel.
-
The Rockbox Project
RMX (2 versions)
1980
Real-time operating system designed specifically for use with the Intel 8080 and Intel 8086 family of processors.
i8080 and i8086
Intel / TenAsys Corporation, USA
RMS09, RMS68K
1980s
Real time operating system for 6809 and 68000 family.
6809, 68000
Motorola, USA
-
RMS
1984<
Operating system for Datapoint computers.
Datapoint computers
USA
-
RM/COS
1980s
Multiuser, multiprocessing OS for 68000. Cobol-based business environment for an abstract C-machine.
68000
Ryan-McFarland, USA
-
RISC/os
1985
Port by MIPS for its MIPS-based computers.
MIPS computers
MIPS Technologies, USA
RISC OS (9 versions)
1987
Originally released in 1987 as Arthur 1.20. First release was to be called Arthur 2, but was renamed to RISC OS 2, and was first sold as RISC OS 2.00 in April 1989.
ARM
Acorn Computers, Castle Technology, RISCOS, UK
RISC iX
1988
Discontinued Unix operating system designed to run on the Acorn Archimedes. Derived from BSD 4.3, by Acorn computers, for their ARM family of machines.
Acorn Archimedes
Acorn Computers, UK
RIOT
2000s
Small operating system for networked, memory-constrained systems with a focus on low-power wireless Internet of Things (IoT) devices.
TI MSP430, ARM7, ARM Cortex-M0-M0+-M3-M4, Atmel AVR, MIPS32r2
FU Berlin, INRIA, HAW Hamburg, Germany
RIO/CP
1980
Network operating system for the ZNET.
Zilog ZNET
USA
-
RIG
1978c
Rochester Intelligent Gateway. Network OS. Influenced Accent and Mach.
-
University of Rochester, UK
-
Rhapsody
1997
Code name given to Apple Computer's next-generation operating system during the period of its development between Apple's purchase of NeXT in late 1996 and the announcement of Mac OS X (now called "macOS") in 1998.
NeXT
Apple, USA
REX-80/86
1981
Operating system for 8080 and 8086. Real-time executive that offers 16-bit microprocessing and coprocessing support.
i8086
Systems & Software, USA
REX-80/80
1978c
Operating system for 8080 and 8086.
i8080
Systems & Software, USA
-
REX OS
1999
Microkernel OS. Usually an embedded cell phone OS.
ARM
Qualcomm, USA
Retro
1990s
FORTH-based OS and a prototype low-level infrastructure for the TUNES project.
-
Tom Novelli
Research Unix
1978
Term used to refer to versions of the Unix operating system developed in the Bell Labs Computing Science Research Center.
DEC PDP-7, PDP-11, VAX, Interdata 7/32 and 8/32
Bell Labs, USA
REPOS
1978c
Operating System for small PDP-11's attached to a host computer.
DEC PDP-11
USA
-
Replicant
2010
Free operating system (OS) based on the Android mobile platform that aims to replace all proprietary Android components with free-software counterparts.
-
Paul Kocialkowski
Remix OS
2000s
Operating system for personal computers. Alow PC users to run Android mobile apps on any compatible Intel-based PC.
IA-32, x86-64, ARM
Jide Technology, China
REGULUS
1980s
System III based Unix clone, with V6, V7, and SysV extensions.
68000
Alcyon, USA
-
Reduced Core Monitor
1970c
Modular, core-resident standard operating monitor designes dor use on small or very speclized real-time systems.
CDC 1700
Control Data, USA
-
Redox
2015
Written in Rust.
-
Jeremy Soller
RedHawk Linux
2000s
Real-time operating system is designed specifically for mission-critical server and embedded applications.
x86, ARM64
Concurrent, USA
Red Star OS
2008
North Korean Linux distribution. Prior to its release, computers in North Korea typically used Red Hat Linux and Windows XP
i386 (x86), ARM
Korea Computer Center, North Korea
Red Hat Linux (1 versions)
1994
Linux distribution.
-
Red Hat, USA
Red Hat Enterprise Linux 6
2010
-
-
-
-
Red Hat Enterprise Linux 5
2007
-
-
-
-
Red Hat Enterprise Linux 4
2005
-
-
-
-
Red Hat Enterprise Linux 3
2003
-
-
-
-
Red Hat Enterprise Linux 2.1 ES
2003
-
-
-
-
Red Hat Enterprise Linux 2.1 AS
2002
-
-
-
-
Red Hat Enterprise Linux (8 versions)
2002
Linux for servers.
Servers
Red Hat, USA
REALITY
1973
Early version of PICK.
Microdata 1600
USA
-
Realcom system
1964
Operating system for the RCA 3301 computer.
RCA 3301
RCA, USA
-
REAL/NG
2003
Was IMS' attempt to create the "Next Generation" of REAL/32, also named "REAL/32 for the internet age". REAL/NG promised "increased range of hardware from PCs to x86 multi-processor server systems".
IA-32, x86-64
Intelligent Micro Software, UK
REAL/32
1994
Intelligent Micro Software (IMS) acquired a license to further develop Multiuser DOS from Novell in 1994 and renamed their product REAL/32.
i386
Intelligent Micro Software, UK
ReaGOS
2000s
Preemptive single-stack kernel.
x86, ATmega, ARM, portable
OBP Research, Finland
ReactOS (34 versions)
2003
Open source OS designed to be binary compatible with Windows NT and its variants (Windows XP, Windows 2000, etc.); currently in development phase.
IA-32, x86-64, ARM
ReactOS Foundation
rdos (2)
2000c
x86 based OS written entirely in assembly. Provides protection with segmentation. Multithreaded with support for DOS, DPMI and Win32 console apps. Possible to add other emulated environments like UNIX.
-
Leif Ekblad, Sweden
RDOS (1)
1972
Real-time Disk Operating System. With variants: RTOS and DOS.
Data General Nova
Data General, USA
-
RCA OSs POS
1965>
Primary OS.
Hitachi HITAC 8000
Hitachi, Japan
-
RC 4000 Multiprogramming System (RC)
1969
Discontinued operating system developed for the RC 4000 minicomputer .
Regnecentralen RC 4000
Regnecentralen, Denmark
RBM
1969
Real-Time Batch Monitor. Capable of simultaneously performing multiple real-time processing tasks.
Mitsubishi MELCOM-7000, Xerox Data Systems minicomputers
Xerox, Mitsubishi, Japan
Raven
1999
Another attempt at making an OS for x86 PCs from scratch. Now TTP.
-
PiSig Innovations Lab.
RAMON
1990s
Embedded operating system for Soviet personal computers BK-0010 and BK-0010-01. The file system used is compatible with the RT-11 file system.
Elektronika BK-0010
Alexander Ermakov, Russia
RAFOS
1980s
Real-time System with Buffer Functions. Soviet RT-11 clone.
SM EVM
Russia
QuickRAM Operating System
2003
Portable media based operating system. It loads itself into RAM and allows you to do system maintenance related tasks.
-
Phillip Ferguson
QuickOS
1990s
Really-quick-realtime-multitasking OS.
-
Andreas Ziermann
QubesOS
2012
Security-focused desktop operating system that aims to provide security through isolation.
x86-64
Invisible Things Lab, Poland
Quark
2003
Object Oriented 32 bit operating system. It aims to be a complete multitasking kernel.
-
Ananth Shrinivas
Qt Extended
2000s
Application platform for embedded Linux-based mobile computing devices such as personal digital assistants, video projectors and mobile phones.
PDA, Mobile phones
Qt Software, Finland
QP/M
1980s
Complete CP/M compatible replacement for CCP and BDOS.
Altair
MICROCode Consulting, USA
QP
2000s
Quantum Platform. Family of lightweight, open source software frameworks for building responsive and modular real-time embedded applications as systems of cooperating, event-driven active objects (actors).
ARM7/9, ARM Cortex-M3-M0, MSP430, TMS320C28x, AVR, AVRXmega, ColdFire, 68HC08, M16C/R8C, H8, 8051, 80251, PIC18, PIC24/dsPIC33, Nios II, PSoC1
Quantum Leaps, USA
QNX
1982
POSIX, microkernel OS. Usually a real time embedded OS), Unix-like real-time operating system, aimed primarily at the embedded systems market.
i8088, x86, MIPS, PowerPC, SH-4, ARM, StrongARM, XScale
Quantum Software Systems, Canada
QDOS (2)
1980s
Operating system for the British Sinclair QL. Power of UNIX, SuperBASIC command language, up to 20 concurrent tasks with windows.
Sinclair QL
USA
-
QDOS (1)
1980c
Quick and Dirty Operating System. Simplified version of CP/M for the i8086.
-
Tim Patterson/Seattle Computer Products, USA
-
PWB/UNIX
1977
Programmer's Workbench (PWB/UNIX). Early, now discontinued, version of the Unix operating system created in the Bell Labs Computer Science Research Group of AT&T.
-
Bell Labs, USA
PVOS
1999
Proprietary OS for Casio Pocket Viewer.
Casio Pocket Viewer
Casio, Japan
PureDarwin
2010s
Community project to make Darwin more usable (some people think of it as the informal successor to OpenDarwin.
PowerPC
-
Puma
1990s
Operating system at Sandia National Laboratories with a distributed memory architectures.
-
Sandia National Laboratories, USA
PTSS
1970s
People's Time Sharing System. A time sharing system for the CDC 6600 based on BKY.
CDC 6600
Lawrence Berkeley Laboratories, USA
-
PTS-DOS (1 versions)
1993
MS DOS clone.
IBM PC compatibles
Phystechsoft, Russia
PTOS
1970c
Paper Tape OS for the Cincinnati Milacron CIP/2200.
Cincinnati Milacron CIP/2200
USA
-
pSOS (2)
1982
Portable Software On Silicon. real time operating system (RTOS) and developed/marketed for the first part by Software Components Group (SCG).
68000
Alfred Chao, SCG, ISI, Wind River Systems, USA
PSOS (1)
1978c
An Experimental Provably Secure Operating System.
-
USA
-
Protothreads
2000s
Extremely lightweight stackless threads designed for severely memory constrained systems.
AVR 8051
Adam Dunkels, Sweden
Proolix
2000s
Unix clone project for the old 8086 PCs, from former USSR.
i8086
Serge Pustovoitoff, Russia
Prolog-Dispatcher
1980s
Used to control Soviet Buran space ship.
Buran
Russia
ProDOS (2 versions)
1983
Name of two similar operating systems for the Apple II series of personal computers. The original ProDOS, renamed ProDOS 8 in version 1.2, is the last official operating system usable by all 8-bit Apple II series computers.
Apple II
Apple, USA
PRO/TSX-PLUS
1980s
Version of TSX-PLUS for the PRO-350.
DEC PRO-350
S&H Computer Systems, USA
-
PRIMOS
1972
Sometimes spelled PR1MOS and PR1ME. Written in FORTRAN IV, that didn't have pointers, while later versions, around version 18, written in a version of PL/1, called PL/P.
Prime Computers
Prime Computer, USA
Prex
2005c
Open source, royalty-free, real-time operating system for embedded systems. It is designed and implemented for resource-constrained systems that require predictable timing behavior.
ARM, IA-32, x86
Kohsuke Ohtani
PowerTV
2000s
Open platform for developing, delivering, and driving real-world, broadband digital and analog video over two-way hybrid fiber coax (HFC) systems.
-
PowerTV, USA
-
PostmarketOS
2017
Free and open-source operating system under development primarily for smartphones, based on the Alpine Linux distribution.
ARM, ARM64, x86, x86-64
postmarketOS open-source community
POS (2)
1998
Peter Operating System. OS research project.
-
Peter
POS (1)
1968c
Primary OS for RCA Spectra 70 And Hitachi HITAC computers.
RCA Spectra 70, Hitachi HITAC 8000
RCA, USA
-
PORTX
1970s
ROM-Based Real-time executive.
-
Destek Group, USA
-
Portos
2000s
Real Time Operating System.
ARM
Softwave Wireless, France
PonyOS
2013
Hobby Unix-like operating system based on ToaruOS.
-
K. Lange
polyFORTH
1980s
FORTH environment for Z80, 8080, 8086, 6809, 68000, and PDP-11 families.
Z80, i8080, i8086, 6809, 68000, and DEC PDP-11
FORTH, USA
-
POK
2000s
Partitioned Operating System. Real-time embedded operating system for safety-critical systems (avionics, aerospace). It provides several functionalities and complies with many industrial standards, such as ARINC653 or POSIX. POK was designed to be used in safety-critical systems as well as in public systems.
x86, PowerPC, SPARC
France
Plurix
1985
Aka Tropix. Integrated environment (OS/programming language combination) based on Java with a custom native code compiler for x86, an orthogonal persistent Distributed Shared Memory (DSM) for PC clusters, with a consistency model based on restartable transactions coupled with an optimistic synchronization scheme.
-
Federal University of Rio de Janeiro - UFRJ, Brazil
Platform OS
1990s
Operating system wanted to achieve platform-independence through a low-level VM.
-
Joel Utting
Plan B
2008
Distributed OS derived from Plan 9 and Off++ microkernel.
-
Universidad Rev Juan Carlos, Madrid, Spain
Plan 9 (3 versions)
1992
Distributed OS based on original Unix design principles yet functionally different and going much further.
-
Bell Labs, USA
Pitt Time Sharing System
1968c
An early Timesharing system developed for the IBM S/360.
IBM System/360
University of Pittsburgh, USA
-
Pirat-Os
2004
German Language OS Project.
-
Dominic Fischer, Switzerland
Pink
1988
Code-name for Taligent OS.
Apple Macintosh
Apple, USA
Pilot operating system
1980
Pilot operating system (used in Xerox Star workstations) was written in the Mesa programming language.
Xerox Star
Xerox, USA
PilOS
2000s
Full blown 64-bit PicoLisp runs directly on a standard x86-64 PC hardware.
x86-64 PC
-
Piko/RT
2000s
Tiny Linux-like real-time operating system kernel, optimized for ARM Cortex-M series microprocessors. Based on the OSEK/VDX standard.
ARM Cortex-M3/M4
-
PikeOS
2000s
Certified real time operating system for safety and security critical embedded systems.
PPC, x86, ARM, MIPS, SPARC-LEON, SuperH
SYSGO, Germany
PICOS18
2000s
Real-time operating system for PIC18 microntroller.
PIC18
Pragmatec, France
picoOS
2000s
Highly configurable and very fast real time operating system. It targets a wide range of architectures, from the small 8 bit processors with very low memory till huge architectures like 32 bit processors with lots of memory.
6502, 80x86, ARM7, AVR, PowerPC, Cortex-M, MSP430, PIC32
-
PicoBSD
1990s
One floppy version of FreeBSD, configured mainly for networking applications. Superseded by NanoBSD.
x86
Michael Bialecki, Poland
Pick
1965
Often licensed and renamed. Business-oriented OS featuring an integral relational database.
-
Prime Computer, Pick Systems, USA
Phoenix-RTOS
2004
Real-time operating system designed for Internet of Things appliances. Successor to the Phoenix operating system.
ARM7, IA-32, eSI-RISC
Phoenix Systems, USA
Phoenix
1999
Based on a concept of persistent virtual memory, and is managed-code oriented. Phantom OS is one of a few OSes that are not based on classical concepts of Unix-like systems.
IA-32
Warsaw University of Technology, Poland
Pharos
2000s
Free open-source RTOS for Critical Systems.
ARM926, Cortex-R5, Cortex-M4, Cortex-A53 (all with memory protection)
CEA, Delphi, Geensys, France
Phar Lap ETS
2000s
Real-time operating system, used for instance on LabVIEW real-time targets. Now part of IntervalZero.
IA-32
Pha Lap, USA
Phantom OS
2000s
Based on a concept of persistent virtual memory, and is managed-code oriented. Phantom OS is one of a few OSes that are not based on classical concepts of Unix-like systems.
IA-32, MIPS and amd64
Digital Zone, Russia
pfsense
2006
Open source firewall/router computer software distribution based on FreeBSD.
-
Rubicon Communications, USA
PETROS
1990s
Microsoft Windows clone programmed in a proprietary Object Pascal, by Trumpet Software International (producer of the famous Trumpet Winsock). 32-bit operating system for the PC platform.
IBM PC compatibles
Trumpet Software, Tasmania
Personal CP/M-86
1983
Was only provided for several specific European computers by the manufacturers Siemens PG685 and PC16-20, Apricot PC.
i8086
Digital Research, USA
Personal CP/M
1984c
ROM-based version of CP/M 2.2 for small home computers.
Z80
Digital Research, USA
PERQ Operating System (POS)
1980s
Written in PERQ Pascal.
PERQ Computers
PERQ, USA
-
Perpos
1970s
Perpetual Processing OS for Computer Consoles Power 55/5. 68000-based multiple CPUs. UNIX-based system featuring high reliability.
Computer Consoles Power 55/5
USA
-
PenPoint OS
1991
Product of GO Corporation and was one of the earliest operating systems written specifically for graphical tablets and personal digital assistants.
Tablets, PDA
GO, USA
PEN/GEOS
1992
Graphical user interface based on PC/GEOS.
HP OmniGo 100 and 120, Nokia Communicator, Casio Z-7000
GeoWorks
Pegasus (1 versions)
1990s
Operating system support for distributed interactive multimedia.
-
University of Twente, University of Cambridge, UK
PECOS
1960s
CDC operating system, descendent of Chippewa.
-
Control Data, USA
PDP-6 Monitor
1965c
Monitor System for the PDP-6.
DEC PDP-6
USA
-
PDP-10/50 Swapping Monitor
1968c
An early OS for the PDP-10.
DEC PDP-10
USA
-
PDP-10
1974<
Virtual machine system for the PDP-10.
DEC PDP-10
USA
-
PDOS
1980s
Multiuser, multitasking, realtime OS for the 68000, and TI-9900 and 9905.
68000, and TI-9900 and TI-9905
Eyring Research, USA
PCVMS
1985c
Small, inexpensive VMS lookalike.
-
Wendin, USA
-
PCUNIX
1985c
Small, inexpensive UNIX lookalike.
-
Wendin, USA
-
PCP
1960s
Primary Control Program, very early version of OS/360 that didn't support multiprogramming.
IBM System/360
IBM, USA
-
PC/NOS
1980s
Network OS for MS-DOS or CP/M.
-
Applied Intelligence, USA
-
PC/IX
1984
Derivated from UNIX System III from AT&T.
IBM PC compatibles
IBM, USA
PC/GEOS
1990
See GeoWorks.
IBM PC compatibles
Berkeley Softworks, USA
PC-UX
1985c
Discontinued NEC port of UNIX System III for their APC III and PC-9801 personal computer. It had extensive graphics capability.
NEC APC III, PC-9801
NEC, Japan
PC-MOS/386
1987
DOS-like, but multiuser/multitasking.
x86
The Software Link, USA
PC DOS (8 versions)
1981
IBM's DOS variant, developed jointly with Microsoft.
IBM PC compatibles
IBM, Microsoft, USA
Paxym FreeBSD
2007
BSD based OS for Cavium Octeon MIPS architecture processors.
Cavium Octeon
Paxym, USA
-
PaulOS
2002
Embedded operating system.
Atmel board
Paul Sheer
PascalDOS
1990s
Operating system for Soviet personal computers BK-0010 and BK-0010-01, intended for programming in the Pascal programming language.
Elektronika BK-0010
Russia
Partikle
2000s
Embedded real time operating system designed to be POSIX compliant.
SPARC LEON 2-3-4, x86
fentISS, Spain
PalmDOS
1992
Very resource-light DR DOS 6.0 derivative aimed at the emerging Palmtop/PDA market.
-
Digital Research, USA
Palm webOS 1
2009
Mobile Operating system based on an Linux core.
Palm Pré, Palm Pixi
Palm, USA
-
Palm OS
1996
Discontinued mobile operating system initially developed by Palm for personal digital assistants (PDAs).
Palm PDA
Palm, USA
P2DOS
1980s
CP/M 2.2 with P2DOS as BDOS replacement.
Altair
USA
P/OS
1980s
Professional Operating System. Standard OS for the PRO-350 and PRO-380. Derived from RSX-11.
DEC PRO-350 and PRO-380
DEC, USA
-
p-System
1978c
Support environment for UCSD Pascal, based on an abstract "p-machine." Now distributed by SofTech Microsystems.
-
University of California, USA
-
p
1978c
Time-sharing OS for laboratory automation.
-
USA
-
OZONE
1990s
Object-oriented OS primarily based on VMS with the use of the GNU toolchain, and Unix-style pipes (also using record-oriented pipes, a VMS feature called a "mailbox").
-
Ozone Enterprises, USA
OSx
1980s
Operating System for Pyramid Computers. Supports UNIX System V and BSD 4.2 concurrently.
Pyramid Computers
USA
-
OSv
2013
Cloud computing focused computer operating system. It is a special-purpose operating system built to run as a guest on top of a virtual machine, thus it does not include drivers for bare-metal hardware.
x86-64 using the KVM, Xen, VMware, and VirtualBox hypervisors
Cloudius Systems, Israel
OSSO
1999
A Micro Kernel Operating System written from scratch
-
Alessandro Iurlano
OSKit
1990s
Complete modular infrastructure that provides all the "bricks" (resources) needed to easily build an OS, focusing on what interests you, and reusing components for the rest.
-
University of Utah, USA
OSIV/XSP
1990
Successor operating system to Fujitsu’s two OSs: medium-scale general-purpose OS OSIV/ESPIII, and large-scale general-purpose OS OSIV/X8 FSP.
Fujitsu FACOM M series
Fujitsu, Japan
OSIV/X8
1977
One of the operating systems for Fujitsu’s FACOM M series general-purpose computers, and was a large general-purpose OS positioned between super-large general-purpose OS OSIV/F4 and medium general-purpose OS OSIV/F2.
Fujitsu FACOM M series
Fujitsu, Japan
-
OSIV/MSP (2 versions)
1989
Super-large general-purpose operating system.
Fujitsu FACOM M-1800
Fujitsu, Japan
OSIV/F4
1975
One of the operating systems for Fujitsu’s FACOM M series general-purpose computers, and was a super-large general-purpose OS.
Fujitsu FACOM M series
Fujitsu, Japan
OSIV/F2
1977
One of the operating systems for Fujitsu’s FACOM M series general-purpose computers, and was a medium-scale general-purpose OS for medium-scale business operations
Fujitsu FACOM M series
Fujitsu, Japan
OSIV/ESPIII
1984
Successor OS to medium-scale general-purpose OS OSIV/ESP V2. medium-scale general-purpose operating system.
Fujitsu FACOM M series
Fujitsu, Japan
OSII
1971
Operating system for Fujitsu’s large-scale general-purpose computers FACOM 230-45S and FACOM 230-55.
Fujitsu FACOM 230-45S and Fujitsu FACOM 230-55
Fujitsu, Japan
-
osFree
2009
Free Open Source software operating system development project, aiming to replace eventually all OS/2 subsystems with Open source analogues.
-
osFree Development Team
OSF/1
1992
Developed into a commercial offering by DEC.
-
DEC, USA
OSEK
1993
Offene Systeme und deren Schnittstellen für die Elektronik in Kraftfahrzeugen. Standards body that has produced specifications for an embedded operating system, a communications stack, and a network management protocol for automotive embedded systems
Engine control units
Germany
OSE
1990s
Operating System Embedded (known by the acronym Enea OSE). Real-time embedded operating system.
ARM, PowerPC, MIPS
ENEA, Sweden
OSD/XC
2000s
BS2000 ported to an emulation on a Sun SPARC platform.
Fujitus SQ series business servers
Fujitsu-Siemens, Japan
OSA
2000s
Cooperative multitasking real-time operating system for Microchip PIC-controllers.
PIC10-PIC24, AVR 8-bit, STM8
Russia
OS7
1972
Large-scale software system that supported a virtual space and multiple processors.
Hitachi HITAC 8700/8800
Hitachi, Japan
-
OS4000
1977
Operating system introduced as the successor to GEC DOS, for its range of GEC 4000 series 16-bit, and later 32-bit, minicomputers.
GEC 4000 series
GEC Computers, UK
OS21
2000s
Real-time kernel.
ST40/SH4, ST200, ARM
STMicrosystems, Canada
-
OS2000 (2)
2000s
See Baget RTOS.
MIPS (Baget-MIPS variant), KOMDIV-32, KOMDIV-64, Intel BSPs (x86)
Russian Academy of Sciences, Russia
OS2000 (1)
1970s
Operating system for Honeywell 200/2000.
Honeywell 200/2000
USA
-
OS20
2000s
Real-time kernel.
ST20 microprocessors
STMicrosystems, Canada
-
OS161
1990s
Instructional OS produced for an undergraduate introductory operating system concepts at Harvard, by the same group of VINO. Mainly inspired to BSD Unix.
-
Harvard University, USA
OS/VS (3 versions)
1972
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.
IBM System/370
IBM, USA
-
OS/SVS
1972
Single Virtual Space. Initial release of OS/VS2. Virtual Storage OS for IBM S/370, based closely on OS/MVT.
IBM System/370
IBM, USA
-
OS/RT
1970s
Real-time OS kernel for a variety of CPUs.
-
Destek Group, USA
-
OS/PCP
1966
Primary Control Program. Early batch-serial version of IBM OS/360.
IBM System/360
IBM, USA
-
OS/MVT
1967
Multiprogramming with a Variable Number of Tasks. Popular OS for IBM 360/370.
IBM System/360, System/370
IBM, USA
-
OS/MVS
1974
Multiple Virtual Space. Virtual storage OS for IBM 370, derived from MVT. Originally called VS2, Release 2.
IBM System/370
IBM, USA
-
OS/MFT-II
1968c
-
-
IBM, USA
-
OS/MFT
1967
Multiprogramming with a Fixed number of Tasks. Simple version of OS/MVT suitable for processors with limited memory.
-
IBM, USA
-
OS/C
2001c
Small, open-source, Unix-like OS. Designed to preform networking tasks and other file-oriented processes whiltaking up very little of the computer's processing power.
-
Collin
OS/A WASP
1990s
Operating system for the Soviet personal computers BK-0010.
Elektronika BK-0010, BK-0011
Russia
OS/80
1970s
Early OSE version for the Zilog Z80 processor.
Z80
ENEA, Sweden
-
OS/8
1971
Primary operating system used on the Digital Equipment Corporation's PDP-8 minicomputer. Ancestor of RT-11.
PDP-8
DEC, USA
OS/700
1973c
Realtime multiprogramming OS for Honeywell System 700.
Honeywell System 700
USA
-
OS/7
1968c
Operating Systems for UNIVAC 9700.
UNIVAC 9700
USA
-
OS/400 (4 versions)
1988
Descendant of System/38 CPF, include System/36 SSP environment.
IBM System/400
IBM, USA
-
OS/4
1968c
Operating Systems for UNIVAC 9700.
UNIVAC 9700
USA
-
OS/390
1995
Upgrade from MVS, with an additional Unix environment.
IBM System/390
IBM, USA
OS/360 MVT
1967
Multiprogramming with a Variable number of Tasks. Level of OS/360.
IBM System/360
IBM, USA
OS/360
1966
First official OS targeted for the System/360 architecture.
IBM System/360 and successors
IBM, USA
OS/32-ST
1975c
Real time serial and multitasking operating systems for Interdata (later Perkin-Elmer) 7/16 and 7/32 minicomputers.
Interdata 7/16 and 7/32, Concurrent computers
USA
-
OS/32-MT
1975c
Real time serial and multitasking operating systems for Interdata (later Perkin-Elmer) 7/16 and 7/32 minicomputers.
Interdata 7/16 and 7/32, Concurrent computers
USA
-
OS/200
1968c
Operating system for Honeywell Series 200 family.
Honeywell Series 200 family
USA
-
OS/2 (2)
1984<
Operating System for the MDS Series 21.
MDS Series 21
Mohawk, USA
-
OS/2 (1) (12 versions)
1987
Series of computer operating systems, initially created by Microsoft and IBM under the leadership of IBM software designer Ed Iacobucci.
IBM PC compatibles
IBM, Microsoft, USA
OS/1100
1970s
Operating System for UNIVAC 1106 and 1110.
UNIVAC 1106 and 1110
Sperry Univac, USA
-
OS/10
1984<
Operating System for the MDS Series 21.
MDS Series 21
USA
-
OS-V
1987
Operating system for the V-7000 series of 32-bit-architecture multipurpose computers.
Toshiba V-7000 series
Toshiba, Japan
OS-9000
1989
Unix-like RTOS. (OS from Microware for Intel x86 based microcomputers; based on OS-9, written in C).
Intel 80386 PC
Microware Systems, USA
-
OS-9 (1 versions)
1980
Family of real-time, process-based, multitasking, multi-user operating systems.
ARM-strongARM, MIPS, PowerPC, SuperH, x86/Pentium, XSCALE, Motorola 6809, 680x0, SPARC
Microware Systems, USA
OS-80/III
1980
Double-density Model III version.
-
-
-
OS-80 (2 versions)
1980
Formerly MICRODOS. Fast extendable BASIC-language disk operating system.
Tandy TRS-80
Percom, USA
-
OS-4
1978
Disk operating systems for office computers.
NEC NEAC System 100
NEC, Japan
OS-3 (2)
1968c
Oregon State Open Shop OS. A timesharing system for the CDC 3300.
CDC 3300
USA
-
OS-3 (1)
1978
Floppy disk operating systems for office computers.
NEC NEAC System 100
NEC, Japan
OS-1
1978
Drum memory operating systems for office computers.
NEC NEAC System 100
NEC, Japan
OS X (4 versions)
2001
See MacOS.
Apple iMac
Apple, USA
OS RV
1980s
RSX-11M-like multiprogramming operating system. The command are in english.
SM-4, SM-1420, Elektronika-100-25
Russia
OS MIKROS-86
1980s
Soviet operating system for the SM-1810 computer.
SM-1810
Russia
-
OS IPM
1970
Operating system for the BESM-6 computer.
BESM-6
IPM, Russia
OS ES (2 versions)
1970s
Operating system for ES EVM. Comparable to S/360.
ES EVM
Russia
OS DVK
1980s
Soviet RT-11 clone.
DVK ( Elektronika MS-0501 and Elektronika MS-0502)
Russia
-
OS BK-11
1990s
The only “official” OS for the BK-0010/11 computers, supported by the manufacturer, and included in the delivery of the computer.
Elektronika BK-0010