History of IBM mainframe operating systems information
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Historical account
The history of IBM mainframe operating systems is significant within the history of mainframe operating systems, because of IBM's long-standing position as the world's largest hardware supplier of mainframe computers. IBM mainframes run operating systems supplied by IBM and by third parties.
The operating systems on early IBM mainframes have seldom been very innovative, except for TSS/360 and the virtual machine systems beginning with CP-67. But the company's well-known reputation for preferring proven technology has generally given potential users the confidence to adopt new IBM systems fairly quickly. IBM's current mainframe operating systems, z/OS, z/VM, z/VSE, and z/TPF, are backward compatible successors to those introduced in the 1960s.
History of IBM mainframe operating systems
Early mainframe computer OSes
GM OS & GM-NAA I/O (1955)
BESYS (1957)
UMES (1958)
SOS (1959)
IBSYS (1960)
MIT CTSS (1961)
7040/7044 Operating System (16/32K) (7040-PR-150)
1410/7010 Operating System (1410-PR-155)
Miscellaneous S/360 line OSes
BOS/360 (1965)
TOS/360 (1965)
TSS/360 (1967)
MTS (1967)
ORVYL (1967)
RACS (1965)
RAX (1966)
MUSIC (1972)
MUSIC/SP (1985)
DOS/360 and successors (1966)
DOS/360 (1965)
DOS/VS (1972)
DOS/VSE (1979)
VSE/AF (1979)
VSE/SP (1983, 1985)
VSE/ESA (1991)
z/VSE (2005)
VSEn (2021)
OS/360 and successors (1966)
MFT (1966)
MFT II (1968)
OS/VS1 (1972)
OS/VS1 BPE
MVT (1967)
65MP
OS/VS2R1 (SVS) (1972)
MVS (OS/VS2R2 and later) (1974)
MVS/SE (1978)
MVS/SE 2 (1979)
MVS/SP Version 1 (1980)
MVS/XA (1983)
MVS/ESA (1988)
OS/390 (1995)
z/OS (2000)
VM line
CP-40/CMS (1967)
CP-67/CMS (1967)
VP/CSS (1968)
VM/370 (1972)
VM/BSE (BSEPP)
VM/SE (SEPP)
VM/SP (1980)
VM/XA MA (1984)
VM/XA SF (1985)
VM/XA SP (1988)
VM/ESA (1990)
z/VM (2000)
TPF line
ACP (1967)
TPF (1979)
z/TPF (2005)
UNIX and Unix-like
UTS (1981)
AIX/370 (1990)
AIX/ESA (1991)
MVS/ESA OpenEdition (1993)
VM/ESA OpenEdition (1995)
OS/390 UNIX System Services (1996)
Linux (1999)
z/VM OpenExtensions (2000)
z/OS UNIX System Services (2001)
OpenSolaris (2008)
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