OS/VS1

OS/VS1

Operating System/Virtual Storage 1, or OS/VS1,was an IBM mainframe computer operating system designed to be run on IBM System/370 hardware.It was the successor to the System/360's operating system
MFT (Multiprogramming with a Fixed number of Tasks), a variant of OS/360.OS/VS1, in comparison to its predecessor, was supporting virtual memory (then called "virtual storage") [ [http://www-03.ibm.com/press/us/en/pressrelease/7588.wss IBM press release concerning memory virtualization from 2005] ]

OS/VS1 was generally available during the 1970s and 1980s, and it is no longer supported by IBM.

OS/VS1 was intended to manage a medium-sized work load (for the 1970s) consisting only of batch processing applications.This was in contrast to OS/VS2 which was intended to handle larger work loads consisting of batch applications,online interactive users (using the Time Sharing Option, TSO),or a combination of both.

OS/VS1 was OS/MFT with a single virtual address space; OS/VS2 SVS was OS/MVT with a single virtual address space.

OS/VS1 used the batch job management system Job Entry Subsystem 1 (JES1).

OS/VS1 went through seven product releases.OS/VS1 Release 7 was enhanced by fourth release of the IBM OS/VS1 Basic Programming Extensions (BPE) product.BPE provided support for new 1980s hardware,such as 3380 DASD (disk).

The last OS/VS1 product release,OS/VS1 Basic Programming Extensions (BPE) Release 4,was announced by IBM in 1983 for general availability in March 1984(product 5662-257, announcement letter 283-266, 15 September 1983).

IBM announced the end of functional enhancements to OS/VS1 in 1984. [OS/VS1 Consolidated Stabilization Statement, product 5652-VS1, announcement letter 284-086, 23 February 1984] IBM recommended OS/VS1 installations migrate to MVS/370 or MVS/XA.To assist with the migration to MVS/XA, IBM made the "VM/XA Mirgration Aid".It allowed installations to run OS/VS1 and MVS/XA simultaneously on the same machine, as guests of a third system - VM/XA. This way, the new MVS/XA system could be tested while the old production OS/VS1 system was still in use.

References

* [http://domino.research.ibm.com/tchjr/journalindex.nsf/e90fc5d047e64ebf85256bc80066919c/8eaace3d948cb1f385256bfa00685aa2?OpenDocument Functional structure of IBM virtual storage operating systems, Part I: Influences of dynamic address translation on operating system technology, by M. A. Auslander and J. F. Jaffe, IBM Systems Journal, Volume 12 (1973), No 4, Page 368]
* [http://domino.research.ibm.com/tchjr/journalindex.nsf/e90fc5d047e64ebf85256bc80066919c/0153cda3721b1e4985256bfa00685aae?OpenDocument OS/VS1 Concepts and Philosophies, by T. F. Wheeler, Jr., IBM Systems Journal, Volume 13 (1974), No 3, Page 213]
* [http://domino.research.ibm.com/tchjr/journalindex.nsf/e90fc5d047e64ebf85256bc80066919c/f3b0bdc1a575f74885256bfa00685ab0?OpenDocument The job entry subsystem of OS/VS1, by J. H. Baily, J. A. Howard, and T. J. Szczygielski, IBM Systems Journal, Volume 13 (1974), No 3, Page 253] (The OS/V1 job entry subsystem was named JES1)


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