IBSYS is the name of a discontinued tape-based

operating system An operating system (OS) is system software that manages computer hardware and software resources, and provides common daemon (computing), services for computer programs. Time-sharing operating systems scheduler (computing), schedule tasks for ...

that

IBM International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American Multinational corporation, multinational technology company headquartered in Armonk, New York, and present in over 175 countries. It is ...

supplied with its

IBM 709 The IBM 709 is a computer system that was announced by IBM in January 1957 and first installed during August 1958. The 709 was an improved version of its predecessor, the IBM 704, and was the third of the IBM 700/7000 series of scientific compute ...

IBM 7090 The IBM 7090 is a second-generation Transistor computer, transistorized version of the earlier IBM 709 vacuum tube mainframe computer that was designed for "large-scale scientific and technological applications". The 7090 is the fourth member o ...

and

IBM 7094 The IBM 7090 is a second-generation transistorized version of the earlier IBM 709 vacuum tube mainframe computer that was designed for "large-scale scientific and technological applications". The 7090 is the fourth member of the IBM 700/7000 se ...

computers, and of a significantly different, though similar operating system 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 older

computer language A computer language is a formal language used to communicate with a computer. Types of computer languages include: * Software construction#Construction languages, Construction language – all forms of communication by which a human can Comput ...

compiler In computing, a compiler is a computer program that Translator (computing), translates computer code written in one programming language (the ''source'' language) into another language (the ''target'' language). The name "compiler" is primaril ...

s and

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on the $EXECUTE card: 9PAC, FORTRAN and IBSFAP. Newer language processors ran under IBJOB. IBM later provided similar facilities for the 7040/7044 as IBM 7040/7044 Operating System (16K/32K) 7040-PR-150 and for the

IBM 1410 The IBM 1410, a member of the IBM 1400 series, was a decimal computer with a variable word length that was announced by IBM on September 12, 1960 and marketed as a midrange business computer. It was withdrawn on March 30, 1970. Overview The 1 ...

/ IBM 7010 as IBM 1410/7010 Operating System 1410-PR-155.

IBSYS System Supervisor

IBSYS itself is a

resident monitor In computing, a resident monitor is a type of system software program that was used in many early computers from the 1950s to 1970s. It can be considered a precursor to the operating system. The name is derived from a program which is always pre ...

program, that reads control card images placed between the decks of program and data cards of individual jobs. An IBSYS control card 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 Card or The Card may refer to: Common uses * Plastic cards of various types: **Bank card **Credit card **Debit card **Payment card * Playing card, used in games * Printed circuit board, or card * Greeting card, given on special occasions Arts an ...

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 COBOL (; an acronym for "common business-oriented language") is a compiled English-like computer programming language designed for business use. It is an imperative, procedural, and, since 2002, object-oriented language. COBOL is primarily ...

. Commercial Translator (

COMTRAN COMTRAN (COMmercial TRANslator) is an early programming language developed at IBM. It was intended as the business programming equivalent of the scientific programming language FORTRAN (FORmula TRANslator). It served as one of the forerunners ...

), Fortran IV (IBFTC) and Macro Assembly Program (IBMAP).

Notes

External links

Jack Harper

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 The Computer History Museum (CHM) is a computer museum in Mountain View, California. The museum presents stories and artifacts of Silicon Valley and the Information Age, and explores the Digital Revolution, computing revolution and its impact ...

7090 94 IBSYS OS IBSYS Discontinued operating systems 1960 software {{mainframe-compu-stub

IBSYS System Supervisor

IBJOB Processor

See also

Further reading

Notes

External links