TOS/360

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History of IBM mainframe
operating systems

IBSYS 1950s
CTSS 1961
BOS/360 1965
TOS/360 1965
TSS/360 1967
MUSIC/SP 1960s
MTS 1970s

DOS/360 and successors 1966
- DOS/VS 1972
- DOS/VSE 1980s
- VSE/ESA 1991
- z/VSE 2005

OS/360 and successors 1966
- MFT 1966
  - OS/VS1 1970s
- MVT 1967
  - OS/VS2R1 (SVS) 1972
- MVS (OS/VS2R2) 1974
  - MVS/370 1970s
  - MVS/XA 1980s
  - 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/SP 1980
- VM/ESA 1988
- z/VM 2000

TPF line
- ACP 1967
- TPF 1979
- z/TPF 2000s

Unix-like on IBM mainframes
- UTS 1981
- AIX/370 1990
- AIX/ESA 1991
- Linux 1999

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TOS/360 (Tape Operating System/360) was an IBM operating system for the System/360, used in the early days around 1965 to support the IBM 360 model 30 and similar platforms. TOS was a predecessor to IBM's DOS/360.

TOS died out really early as disks such as the IBM 2311 and IBM 2314 became common with the System/360 whereas they had been a real luxury on the IBM 7090.