OS/VS1

{{Infobox OS

| name = OS/VS1

| logo = IBM logo.svg

| logo caption =

| logo size = 120px

| logo alt =

| screenshot =

| caption =

| screenshot_size =

| screenshot_alt =

| collapsible =

| version of =

| developer = IBM

| family =

| working state = Historic

| source model =

| released =

| discontinued =

| RTM date =

| GA date =

| latest release version = OS/VS1 Basic Programming Extensions (BPE) Release 4

| latest release date = {{Start date and age|1984|03}}

| latest preview version =

| latest preview date =

| marketing target = IBM mainframes

| programmed in = Assembler (XF), PL/S (nee BSL)

| language =

| update model =

| package manager =

| supported platforms = System/370

| kernel type =

| userland =

| ui =

| license = Proprietary

| preceded by = OS/360

| website =

| support status =

| other articles =

}}

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

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.{{cite web |url=http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3148.html |title=System/370 Model 148" |website=IBM |archive-url=https://web.archive.org/web/20050311002817/http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3148.html |archive-date=2005-03-11 |url-status=dead}}

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.{{cite web |url=https://www.ibm.com/support/pages/history-cics-transaction-server |title=History of CICS Transaction Server |website=IBM|date=18 June 2024 }}

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. IBM enhanced OS/VS1 Release 7 with four releases of the IBM OS/VS1 Basic Programming Extensions (BPE), product 5662-257. BPE provides support for new 1980s hardware, such as 3380 Direct Access Storage, and for VM handshaking between VTAM and VM/VTAM Communications Network Application (VCNA).

IBM announced{{cite web

| title = OS/VS1 BASIC PROGRAMMING EXTENSIONS RELEASE 4 PLANNED FOR MARCH 1984 AVAILABILITY 5662-257

| id = 283-286

| date = September 15, 1983

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS283-286/index.html

| work = Announcement letters

| publisher = IBM

| archive-url = https://web.archive.org/web/20211210134820/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS283-286/index.html

| archive-date = 2021-12-10

| url-status = dead

}}

the last BPE release, OS/VS1 Basic Programming Extensions Release 4, on September 15, 1983, with planned general availability in March 1984.

IBM announced{{cite web

| title = OS/VS1 CONSOLIDATED STABILIZATION STATEMENT

| id = 284-086

| date = February 23, 1984

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS284-086/index.html

| work = Announcement letters

| publisher = IBM

| archive-url = https://web.archive.org/web/20211210134820/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS284-086/index.html

| archive-date = 2021-12-10

| url-status = dead

}}

the end of functional enhancements to OS/VS1 in 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 Migration Aid. It allowed installations to run OS/VS1 and MVS/XA simultaneously on the same machine, as guests of a third system{{snd}}VM/XA. This way, the new MVS/XA system could be tested while the old production OS/VS1 system was still in use.

On January 24, 1989, IBM announced{{cite web

| title = IBM VM AND VSE-RELATED LICENSED PROGRAMS WITHDRAWAL FROM MARKETING AND DISCONTINUANCE OF PROGRAM SERVICES

| id = 289-016

| date = January 24, 1989

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS289-016/index.html

| work = Announcement letters

| publisher = IBM

| archive-url = https://web.archive.org/web/20211210134818/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS289-016/index.html

| archive-date = 2021-12-10

| url-status = dead

}}

the intention to withdraw OS/VS1 and OS/VS1 BPE from marketing effective April 24, 1989, and to discontinue service effective February 28, 1990.

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.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

=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){{Cite magazine |url=https://books.google.com/books?id=-2ZtoSPs5IEC&pg=PA22 |title=Free Code Said to Manage IBM Control Block Usage |first=Don |last=Leavitt |magazine=Computerworld |volume=X |issue=49 |page=22 |date=1976-12-06 |publisher=IDG Enterprise |language=en |quote=The modification will be in the next version of the Tone III package and will be available at all Tone customer locations during the first quarter of 1977.}} was marketed by Tone Software Co.{{Cite magazine |url=https://books.google.com/books?id=LD44Qbu9AsUC&pg=PA72 |title=TONE III |type=Advertisement |magazine=Computerworld |volume=XI |issue=8 |page=72 |date=1977-02-21 |publisher=IDG Enterprise |language=en}}

OS/VS1

Description

Remote Entry Services (RES)

IBM upgrades

=Conversational Remote Job Entry=

=TONE for VS1=

References

Further reading