Stored-program computer: Difference between revisions

Revision as of 22:46, 1 May 2022

Revision as of 22:52, 13 October 2022

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===Telecommunication===

The concept of using a stored-program computer for switching of telecommunication circuits is called [[stored program control]] (SPC). It was instrumental to the development of the first [[electronic switching system]]s by [[American Telephone and Telegraph]] (AT&T) in the [[Bell System]],<ref>D.H. Carbaugh and N.L. Marselos, ''Switching System Software'', in ''Fundamentals of Digital Switching Systems'', J. C. McDonald (ed.), Plenum Press (1983), {{ISBN|0-306-41224-1}}</ref> a development that started in earnest by c. 1954 with initial concept designs by [[Erna Schneider Hoover]] at [[Bell Labs]]. The first of such systems was installed on a trial basis in [[Morris, Illinois]] in 1960.<ref>{{cite journal |last1=Joel |first1=A. E. Joel, ''|title=An Experimental Electronic Switching System'', |journal=[[Bell LaboratoryLaboratories Record,]] |date=October 1958 |volume=36 |issue=10 |pages=359-363 |url=https://worldradiohistory.com/Archive-Bell-Laboratories-Record/50s/Bell-Laboratories-Record-1958-10.pdf#page=5 |access-date=October 13, 2022}}</ref> The storage medium for the program instructions was the [[flying-spot store]], a [[photographic plate]] read by an optical scanner that had a speed of about one microsecond access time.<ref>''Electronic Central Office'', Long Lines 40(5) p16 (1960)</ref> For temporary data, the system used a barrier-grid electrostatic [[storage tube]].

==See also==