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The 1940's brought World War II and the need for advancements in technical

equipment with which to win the war.


1943 J. Presper Eckert and John Mauchly begin construction of the Electronic Numerical Integrator And Computer (ENIAC), the first general-purpose electronic digital calculator.  The ENIAC is considered the first electronic computer and was used to calculate ballistic firing tables during World War II. ENIAC


1943  The Colossus, which was a programmable, digital machine also considered by some to be the first electronic computer, became operational in England.colossus


1944  The relay-based Harvard-IBM MARK I, a program-controlled, large-scale calculating machine built by a team led by Howard Aiken, goes to work during World War II providing essential calculations for the U.S. Navy.   Grace Hopper becomes its first programmer.hopper


1947  The Tran resister or transistor is invented by John Bardeen, Walter Brattain, and William Shockley at the AT&T Bell Telephone Laboratories.           Transistor is less breakable, quicker, uses less power, and produces less heat than the vacuum tube.


1948  A big problem with the computers designed so far is the lack of storage.  Andrew Donald Booth creates magnetic drum memory.   It is two inches long and two inches wide and capable of holding 10 bits per inch.


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