IBM 7090/94 IBSYS

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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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IBSYS was the tape based operating system that IBM supplied with its IBM 7090 and IBM 7094 computers. A similar operating system (but with several significant differences), also called IBSYS, was provided with IBM 7040 and IBM 7044 computers. IBSYS was based on SHARE Operating System.

IBSYS itself was really a basic monitor program, that read control card images placed between the decks of program and data cards of individual jobs. An IBSYS control card began with a "$" in column 1, immediately followed by a Control Name that selected the various IBSYS utility programs needed to set up and run the job. These card deck images were read from magnetic tapes, prepared offline, not usually directly from the punched card reader.