Editing Computer program (section)

===ENIAC===
[[File:ENIAC-changing_a_tube.jpg|thumb|right|Glenn A. Beck changing a tube in ENIAC]]
The [[Electronic Numerical Integrator And Computer]] (ENIAC) was built between July 1943 and Fall 1945. It was a [[Turing complete]], general-purpose computer that used 17,468 [[vacuum tube]]s to create the [[Electronic circuit|circuits]]. At its core, it was a series of [[Pascaline]]s wired together.<ref name="eniac-ch5-p102">{{cite book
  | last = McCartney
  | first = Scott
  | title = ENIAC – The Triumphs and Tragedies of the World's First Computer
  | publisher = Walker and Company
  | year = 1999
  | page = [https://archive.org/details/eniac00scot/page/102 102]
  | isbn = 978-0-8027-1348-3
  | url = https://archive.org/details/eniac00scot/page/102
  }}</ref> Its 40 units weighed 30 tons, occupied {{convert|1,800|sqft|m2|0}}, and consumed $650 per hour ([[Inflation|in 1940s currency]]) in electricity when idle.<ref name="eniac-ch5-p102" /> It had 20 [[base-10]] [[Accumulator (computing)|accumulators]]. Programming the ENIAC took up to two months.<ref name="eniac-ch5-p102" /> Three function tables were on wheels and needed to be rolled to fixed function panels. Function tables were connected to function panels by plugging heavy black cables into [[plugboard]]s. Each function table had 728 rotating knobs. Programming the ENIAC also involved setting some of the 3,000 switches. Debugging a program took a week.<ref name="eniac-ch5-p94">{{cite book
  | last = McCartney
  | first = Scott
  | title = ENIAC – The Triumphs and Tragedies of the World's First Computer
  | publisher = Walker and Company
  | year = 1999
  | page = [https://archive.org/details/eniac00scot/page/94 94]
  | isbn = 978-0-8027-1348-3
  | url = https://archive.org/details/eniac00scot/page/94
  }}</ref> It ran from 1947 until 1955 at [[Aberdeen Proving Ground]], calculating hydrogen bomb parameters, predicting weather patterns, and producing firing tables to aim artillery guns.<ref name="eniac-ch5-p107">{{cite book
  | last = McCartney
  | first = Scott
  | title = ENIAC – The Triumphs and Tragedies of the World's First Computer
  | publisher = Walker and Company
  | year = 1999
  | page = [https://archive.org/details/eniac00scot/page/107 107]
  | isbn = 978-0-8027-1348-3
  | url = https://archive.org/details/eniac00scot/page/107
  }}</ref>