IBM 7090/94 IBSYS

IBSYS
Developer	IBM
Working state	Historic
Initial release	1960; 61 years ago
Platforms	IBM 7090 and IBM 7094
License	Proprietary
Preceded by	SHARE Operating System

IBSYS is the discontinued tape-based operating system that IBM supplied with its IBM 709, 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 FORTRAN Monitor System (FMS) and (more likely) Bell Labs' "BESYS" rather than the SHARE Operating System. IBSYS directly supported several old language processors on the $EXECUTE card: 9PAC, FORTRAN and IBSFAP. Newer language processors ran under IBJOB.

IBSYS System Supervisor

IBSYS itself is a resident monitor program, that reads control card images placed between the decks of program and data cards of individual jobs. An IBSYS control card^[a] begins with a "$" in column 1, immediately followed by a Control Name that selects the various IBSYS utility programs needed to set up and run the job. These card deck images are usually read from magnetic tapes prepared offline, not directly from the card reader.

IBJOB Processor

The IBJOB Processor is a subsystem that runs under the IBSYS System Supervisor. It reads control cards that request, e.g., compilation, execution. The languages supported include COBOL. Commercial Translator (COMTRAN), Fortran IV (IBFTC) and Macro Assembly Program (IBMAP).

Notes

^ The control cards included
$*

Comment

$EXECUTE

Call named subsystem, e.g., compiler, IBJOB, utility

$IBSYS

Reinitialize System Supervisor

$IOCS

$ID

Call installation accounting routine

$JOB

Set up new job

$STOP

End a batch of jobs

External links

IBM 7090/94 IBSYS Operating System, Jack Harper
Dave Pitts' IBM 7090 support
IBSYS source archived with Bitsavers
History of FORTRAN and FORTRAN II – FORTRAN II and other software running on IBSYS, Software Preservation Group, Computer History Museum

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[1] The control cards included
$*

Comment

$EXECUTE

Call named subsystem, e.g., compiler, IBJOB, utility

$IBSYS

Reinitialize System Supervisor

$IOCS

$ID

Call installation accounting routine

$JOB

Set up new job

$STOP

End a batch of jobs

[a]

Contents

IBM 7090/94 IBSYS

IBSYS System Supervisor

IBJOB Processor

See also

Further reading

Notes

External links

History of IBM mainframe operating systems
Early mainframe computer OSs GM OS & GM-NAA I/O (1955) BESYS (1957) UMES (1958) SOS (1959) IBSYS (1960) CTSS (1961)
Miscellaneous S/360 line OSes BOS/360 (1965) TOS/360 (1965) TSS/360 (1967) MTS (1967) ORVYL (1967) MUSIC (1972) MUSIC/SP (1985)
DOS/360 and successors (1966) DOS/VS (1972) DOS/VSE (1979) VSE/SP (1983, 1985) VSE/ESA (1991) z/VSE (2005)
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) OS/390 UNIX System Services (1996) Linux (1999) z/OS UNIX System Services (2001) OpenSolaris (2008)