Editing VM (operating system) (section)

== Versions ==

The following versions are known:

; Virtual Machine Facility/370:VM/370, released in 1972, is a [[System/370]] reimplementation of earlier [[CP/CMS]] operating system.
; VM/370 Basic System Extensions Program Product:VM/BSE (BSEPP) is an enhancement to VM/370 that adds support for more devices (such as 3370-type fixed-block-architecture DASD drives), improvements to the CMS environment (such as an improved editor), and some stability enhancements to CP.
; VM/370 System Extensions Program Product:VM/SE (SEPP) is an enhancement to VM/370 that includes the facilities of VM/BSE, as well as a few additional fixes and features.
; Virtual Machine/System Product:VM/SP, a milestone version, replaces VM/370, VM/BSE and VM/SE. Release 1 added [[EXEC2]] and [[XEDIT]] System Product Editor; Release 3 added [[REXX]]; Release 6 added the shared filesystem.<ref>{{cite conference | conference = SHARE August 2004 | title = The Evolution of IBM Mainframes and VM | id = Session 9140 | last = Elliott | first = Jim | date = August 17, 2004 | url = http://www.linuxvm.org/Present/SHARE103/S9140jea.pdf | publisher = [[SHARE (computing)|SHARE]] | website = Linux for S/390 Linux for Big Iron | access-date = October 21, 2007 | archive-date = October 13, 2006 | archive-url = https://web.archive.org/web/20061013194037/http://linuxvm.org/Present/SHARE103/S9140jea.pdf | url-status = live }}</ref>
; Virtual Machine/System Product High Performance Option:VM/SP HPO adds additional device support and functionality to VM/SP, and allows certain S/370 machines that can utilize more than 16 MB of real storage to do so, up to 64 MB. This version was intended for users that would be running multiple S/370 guests at once.<ref name=":0" /><ref>{{cite manual | title = VM/SYSTEM PRODUCT HIGH PERFORMANCE OPTION ANNOUNCED | id = ZP81-0805 | date = October 21, 1981 | url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/5/877/ENUSZP81-0805/index.html&request_locale=en | series = Announcement Letters | publisher = [[IBM]] | access-date = December 17, 2021 | archive-date = December 17, 2021 | archive-url = https://web.archive.org/web/20211217151308/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/5/877/ENUSZP81-0805/index.html&request_locale=en | url-status = live }}</ref>
; Virtual Machine/Extended Architecture Migration Aid: VM/XA MA is intended to ease the migration from MVS/370 to MVS/XA by allowing both to run concurrently on the same processor complex.<ref>{{cite manual | title = VIRTUAL MACHINE/EXTENDED ARCHITECTURE MIGRATION AID | id = ZP81-0811 | date = October 21, 1981 | url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/1/877/ENUSZP81-0811/index.html&request_locale=en | series = Announcement Letters | publisher = [[IBM]] | access-date = December 17, 2021 | archive-date = December 17, 2021 | archive-url = https://web.archive.org/web/20211217151310/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/1/877/ENUSZP81-0811/index.html&request_locale=en | url-status = live }}</ref>
; Virtual Machine/Extended Architecture System Facility: VM/XA SF is an upgraded VM/XA MA with improved functionality and performance.<ref>{{cite manual | title = VIRTUAL MACHINE/EXTENDED ARCHITECTURE (VM/XA) SYSTEMS FACILITY | id = 285-044 | date = February 12, 1985 | url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS285-044/index.html | series = Announcement Letters | publisher = IBM | access-date = December 17, 2021 | archive-date = December 17, 2021 | archive-url = https://web.archive.org/web/20211217151309/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS285-044/index.html | url-status = live }}</ref>
; Virtual Machine/Extended Architecture System Product: VM/XA SP is an upgraded VM/XA SF with improved functionality and performance, offered as a replacement for VM/SP HPO on machines supporting S/370-XA. It includes a version of CMS that can run in either S/370 or S/370-XA mode.<ref>{{cite manual | title = VIRTUAL MACHINE/EXTENDED ARCHITECTURE SYSTEM PRODUCT (VM/XA SP) RELEASE 1 | id = 287-239 | date = June 11, 1987 | url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/9/897/ENUS287-239/index.html | series = Announcement Letters | publisher = IBM | access-date = December 17, 2021 | archive-date = December 17, 2021 | archive-url = https://web.archive.org/web/20211217151305/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/9/897/ENUS287-239/index.html | url-status = live }}</ref>
; Virtual Machine/Enterprise Systems Architecture:VM/ESA provides the facilities of VM/SP, VM/SP HPO and VM/XA SP. VM/ESA version 1 can run in S/370, ESA/370 or ESA/390 mode; it does not support S/370 XA mode. Version 2 only runs in ESA/390 mode. The S/370-capable versions of VM/ESA were actually their own separate version from the ESA/390 versions of VM/ESA, as the S/370 versions are based on the older VM/SP HPO codebase, and the ESA/390 versions are based on the newer VM/XA codebase.<ref>{{cite manual | title = VIRTUAL MACHINE/ENTERPRISE SYSTEMS ARCHITECTURE VERSION 1 RELEASE 1.0 AND VERSION 1 RELEASE 1.1 | id = 290-499 | date = September 5, 1990 | url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/9/897/ENUS290-499/index.html | series = Announcement Letters | publisher = IBM | access-date = December 17, 2021 | archive-date = December 17, 2021 | archive-url = https://web.archive.org/web/20211217151305/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/9/897/ENUS290-499/index.html | url-status = live }}</ref>
; [[z/VM]]:z/VM, the last version still widely used as one of the main [[full virtualization]] solutions for the mainframe market.{{citation needed|date=March 2014}} z/VM 4.4 was the last version that could run in ESA/390 mode; subsequent versions only run in z/Architecture mode.<ref>{{cite manual | title = z/VM V3R1 Enabled for 64-bit Architecture | id = 200-358 | date = October 3, 2000 | url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/8/897/ENUS200-358/index.html | series = Announcement Letters | publisher = IBM | access-date = December 17, 2021 | archive-date = December 17, 2021 | archive-url = https://web.archive.org/web/20211217151307/https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/8/897/ENUS200-358/index.html | url-status = live }}</ref>

The CMS in the name refers to the Conversational Monitor System, a component of the product that is a single-user operating system that runs in a virtual machine and provides conversational [[time-sharing]] in VM.