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Dead operating systems

30 entries marked dead.

Decade1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

FamilyIndependent 29 Unix 16 BSD 5 Linux 4 Windows 4 DOS 3 OS/360 3 OS/2 2 VM 2 CP/M 1 MCP 1 Multics 1 VMS 1

StatusAlive Maintenance Dormant Dead Lost Superseded

Name	Years	Status	Family	Creator / origin
CTSSCompatible Time-Sharing System	1961–1964	Dead	Independent	Fernando Corbató / MIT
OS/360	1966–1972	Dead	OS/360	IBM
CP-67/CMS	1967–	Dead	VM	IBM Cambridge Scientific Center
ITSIncompatible Timesharing System	1967–1990	Dead	Independent	MIT AI Lab
Multics	1969–2000	Dead	Multics	MIT, GE & Bell Labs
TENEX	1969–	Dead	Independent	BBN
RSTS/E	1971–	Dead	Independent	DEC
RSX-11	1972–	Dead	Independent	DEC
RT-11	1973–	Dead	Independent	DEC
CP/M	1974–1983	Dead	CP/M	Gary Kildall / Digital Research
TOPS-20	1976–	Dead	Independent	DEC
Apple DOS	1978–1983	Dead	Independent	Apple / Paul Laughton
Xenix	1980–	Dead	Unix	Microsoft / SCO
Domain/OSApollo DOMAIN	1981–1991	Dead	Independent	Apollo Computer
MS-DOSPC DOS	1981–2000	Dead	DOS	Tim Paterson / Microsoft & IBM
ProDOS	1983–1993	Dead	Independent	Apple
Atari TOS	1985–1994	Dead	DOS	Atari
GEOS	1986–1990	Dead	Independent	Berkeley Softworks
OS/2	1987–	Dead	OS/2	IBM & Microsoft
A/UX	1988–1995	Dead	Unix	Apple
IRIX	1988–2006	Dead	Unix	SGI
SCO OpenServer	1989–	Dead	Unix	SCO
Coherent	1990–	Dead	Independent	Mark Williams Company
Tru64 UNIXDigital UNIX, OSF/1	1992–2012	Dead	Unix	DEC → Compaq → HP
BeOS	1995–2001	Dead	Independent	Be Inc. (Jean-Louis Gassée)
Inferno	1996–	Dead	Independent	Bell Labs / Vita Nuova
Windows CE	1996–	Dead	Windows	Microsoft
SymbianEPOC32	1997–2013	Dead	Independent	Psion → Symbian Ltd / Nokia
OpenSolaris	2008–2010	Dead	Unix	Sun Microsystems
TempleOS	2013–	Dead	Independent	Terry A. Davis