Editing EDVAC (section)

==Installation and operation==
EDVAC was delivered to the [[Ballistics Research Laboratory]] in 1949. After a number of problems had been discovered and solved, the computer began operation in 1951 although only on a limited basis.<ref name=":0" /><ref>{{Cite journal|date=April 1951|title=The EDVAC|url=http://www.dtic.mil/docs/citations/AD0694600|journal=Digital Computer Newsletter|language=en|volume=3|issue=1|pages=2}}{{dead link|date=June 2022|bot=medic}}{{cbignore|bot=medic}}</ref>

In 1952 (April/May), it was running over {{#expr:floor(341/(16+31)) round 0}} hours a day (period from 15 April to 31 May, used for 341 hours).<ref>{{Cite journal|date=July 1952|title=6. Aberdeen Proving Ground Computers: The EDVAC|url=http://www.dtic.mil/docs/citations/AD0694605|journal=Digital Computer Newsletter|language=en|volume=4|issue=3|pages=4}}{{dead link|date=June 2022|bot=medic}}{{cbignore|bot=medic}}</ref>

By 1957, EDVAC was running over 20 hours a day with error-free run time averaging 8 hours. EDVAC received a number of upgrades including [[punched card|punch-card]] I/O in 1954, extra memory in slower [[drum memory|magnetic drum]] form in 1955, and a [[floating-point arithmetic]] unit in 1958.

EDVAC ran until 1962<ref name=":0">{{Cite journal|last=Williams|first=Michael R.|date=1993|title=The origins, uses, and fate of the edvac|journal=IEEE Ann. Hist. Comput.|volume=15|issue=1|pages=30, 32–33, 36–37|citeseerx=10.1.1.705.4726|doi=10.1109/85.194089|s2cid=7842904 }}</ref> when it was replaced by [[BRLESC]].