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Adding local short description: "IBM computer model from 1960s", overriding Wikidata description "mainframe computer model" (Shortdesc helper) |
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==History==
On April 7, 1964, IBM announced the [[IBM System/360]], to be available in six models.<ref>{{cite book|url=https://books.google.com/books?id=Bc8BGhSOawgC&pg=PA275|title=Building IBM: Shaping an Industry and Its Technology|author=Emerson W. Pugh|year=1995|publisher=MIT Press|page=275|___location=Cambridge, Massachusetts|isbn=0-262-16147-8}}</ref><ref>{{cite book|title=From Mainframes to Smartphones|author1=Martin Campbell-Kelly|author2=Daniel D. Garcia-Swartz|year=2015|publisher=[[Harvard University Press]]|isbn=9780674729063}}</ref><ref>Fortune magazine, Sept. 1966, p.118</ref> The 360/40 was first delivered in April 1965.<ref>{{cite web|url=https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_FS360.html|title=System/360 Dates and characteristics|date=23 January 2003 |publisher=IBM}}</ref>
The [[IBM System/360 Model 30|360/30]] and the 360/40 were the two largest revenue producing [[IBM System/360#Summary of models shipped|System/360 models]],<ref name=IBMbook>{{cite book|last1=Pugh|first1=Emerson W.|last2=Johnson|first2=Lyle R.|last3=Palmer|first3=John H.|title=IBM's 360 and early 370 systems|url=https://archive.org/details/ibms360early370s0000pugh|url-access=registration|date=1991|publisher=MIT Press|___location=Cambridge, Massachusetts|isbn=9780262161237}}</ref> accounting for over half of the units sold.<ref>An [[Automatic Data Processing|ADP]] Newsletter cited on page 56 in {{cite book|editor-last=Weiss|editor-first=Eric A.|title=Computer Usage Essentials|date=1969|publisher=McGraw-Hill|lccn=71-76142}} shows sales of the 360 Model 30 (36%) and the Model 40 (22.6%), for a total of 58.6%</ref>
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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., [[Mainz]], Germany; and [[Fujisawa, Kanagawa|Fujisawa]], Japan.<ref>{{cite web|url=https://www-03.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV8001.html|title=Fujisawa plant|website=IBM Archives|date=23 January 2003 }}</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.
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