OS/VS1

Operating System/Virtual Storage 1, or OS/VS1, is a discontinued IBM mainframe computer operating system designed to be run on IBM System/370 hardware. It was the successor to the Multiprogramming with a Fixed number of Tasks (MFT) option of System/360's operating system OS/360. OS/VS1, in comparison to its predecessor, supported virtual memory (then called virtual storage).[1] OS/VS1 was generally available during the 1970s and 1980s, and it is no longer supported by IBM.

OS/VS1
DeveloperIBM
Working stateHistoric
Latest releaseOS/VS1 Basic Programming Extensions (BPE) Release 4 / March 1984 (1984-03)
Marketing targetIBM mainframes
PlatformsSystem/370
LicenseProprietary
History of IBM mainframe operating systems

Description

OS/VS1 was OS/360 MFT II with a single virtual address space; by comparison, OS/VS2 SVS was OS/360 MVT with a single virtual address space. OS/VS1 was often installed on mid-range IBM mainframe systems, such as the System/370 Model 145 and, later, the System/370 Model 148.[2]

OS/VS1 was intended to manage a medium-sized work load (for the 1970s) consisting only of batch processing applications, running within a fixed number of operating system partitions via the batch job management system Job Entry Subsystem 1 (JES1). 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, or TSO), or a combination of both. However, OS/VS1 could, and often did, support interactive applications and users by running IBM's CICS transaction processing monitor as a job within one of its partitions.[3]

Installation and modification of OS/VS1 was accomplished via IBM's cumbersome System Generation (SYSGEN) process.

Remote Entry Services (RES)

OS/VS1 included a replacement for OS/360 RJE. It allowed submission and retrieval of jobs by 2770, 2780 and 3780 terminals and by workstation programs included with OS/VS1 for, e.g., 1130. RES included Remote Terminal Access Method and a closer integration with Job Management than what RJE had.

IBM upgrades

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.[4] 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 Migration 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.

Time-sharing

Although IBM's Time Sharing Option (TSO) required VS2, customers with a 370/145 or 370/148 had other time-sharing options.
One combination was VM/CMS for time sharing, and a guest "machine" running OS/360 MFT II for batch.[5]

Conversational Remote Job Entry

Optional component of OS/360 MFT II, OS/360 MVT and OS/VS1, CRJE allowed the user at a line-mode terminal to edit text datasets, submit jobs and access job output.

TONE for VS1

A non-IBM time-sharing product named TONE (TSO-like, for VS1 / VS ONE)[6] was marketed by Tone Software Co.[7]

gollark: that is not veryCHRISTIANITYof you
gollark: ++delete all dog
gollark: ++delete all dogs
gollark: ++delete the dog
gollark: A vaguely convincing argument I heard about the humans-liking-punishment thing is that it effectively works as a species-wide precommitment to punish people for doing bad things, which discourages people from doing those bad things in advance.

References
  1. IBM press release concerning memory virtualization from 2005
  2. "System/370 Model 148", IBM
  3. "History of CICS", IBM
  4. OS/VS1 Consolidated Stabilization Statement, product 5652-VS1, announcement letter 284-086, 23 February 1984.
  5. During the 1970s, some universities ran the above combination during the day, and "went native" (no VM/CMS) at night, to run heavy batch work, e.g. administrative
  6. mentioned in Computerworld, Dec. 6, 1976, p. 22; the article mentions the planned 1977 release of version III of Tone)
  7. the p. 72 ad from the Feb. 21, 1977 issue of Computerworld, can be found at https://books.google.com/books?id=LD44Qbu9AsUC&pg=PA72&lpg=PA72 and the headline says "The ONLY COMPLETE TIME SHARING SYSTEM FOR VS1"

Further reading
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