IBM System/360 Model 40: Difference between revisions

Revision as of 03:27, 3 December 2017

Revision as of 21:36, 12 May 2018

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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&lpg=PA275|title=Building IBM: Shaping an Industry and Its Technology|author=Emerson W. Pugh|publisher=MIT Press|page=275|___location=Cambridge, Mass.Massachusetts|isbn=0-262-16147-8}}</ref><ref>From Mainframes to Smartphones, by Martin Campbell-Kelly, Daniel D. Garcia-Swartz; 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|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|date=1991|publisher=MIT Press|___location=Cambridge, Mass.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>

==Models==

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==Other==

Although the cover of IBM's MVT Guide<ref>{{cite book|url=http://www.bitsavers.org/pdf/ibm/360/os/R21.7_Apr73/GC28-6720-5_MVT_Guide_Rel_21.7_Aug74.pdf|title=IBM System/360 Operating System: MVT Guide OS Release 21.7|date=August 1974|publisher=IBM|id=GC28-6720-5}}</ref> indicates that even a 360/40 could run MVT,

the IBM [[operating system]] used was usually the realistically sized [[DOS/360]],{{cnCitation 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/mvt/GC28-6551-16_OS_Storage_Estimates_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<ref>http://www.cs.man.ac.uk/CCS/res/res23.htm states: "The System/360 architecture was developed in Poughkeepsie, 80 miles north of New York. Contributions came from people all over IBM, including our Hursley development group." and notes specific involvement in developing the 360/40.</ref> and manufactured at IBM's facilities in: Poughkeepsie, U.S., [[Mainz]], Germany; and [[Fujisawa, Kanagawa|Fujisawa]], Japan.