IBM System/360 Model 40: Difference between revisions

Revision as of 19:02, 15 September 2024

Latest revision as of 02:01, 25 February 2025

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the IBM [[operating system]] used was usually the realistically sized [[DOS/360]],{{Citation needed|date=September 2017}} because all but one model of the 360/40 had less than MVT's minimum memory requirements of 256KB.<ref>{{cite book|url=http://www.bitsavers.org/pdf/ibm/360/os/R21.7_Apr73/GC28-6551-16_Storage_Estimates_R21.7_Apr73.pdf|title=IBM System/360 Operating System: Storage Estimates OS Release 21.7|date=April 1973|publisher=IBM|id=GC28-6551-16}}</ref><ref>{{cite web|author=Ray Saunders |url=http://www.os390-mvs.freesurf.fr/mvs360.htm |title=MVS... And Before OS/360 ? |archive-url=https://web.archive.org/web/20071220191855/http://www.os390-mvs.freesurf.fr/mvs360.htm |archive-date=2007-12-20}}</ref>

The IBM System/360 Model 40 was developed at [[IBM Hursley]]<ref>{{cite journal|url=http://www.cs.man.ac.uk/CCS/res/res23.htm|title=Editorial|author=Nicholas Enticknap|journal=Resurrection: The Bulletin of the Computer Conservation Society|issue=23|quote=Mike Flinders, who also worked at Hursley where the 360/40 was designed}}</ref> and manufactured at IBM's facilities in: Poughkeepsie, U.S.New York, [[Mainz]], Germany; and [[Fujisawa, Kanagawa|Fujisawa]], Japan.<ref>{{cite web|url=https://www.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV8001.html|title=IBM Archives: Fujisawa plant|website=IBM|date=23 January 2003|archive-url=https://web.archive.org/web/20230924020615/https://www.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV8001.html|archive-date=2023-09-24|url-status=dead}}</ref>

A modified Model 40 ran [[CP-40]], the ancestor of [[CP/CMS]], which in turn was the progenitor of the [[z/VM|VM]] line.