19 h, aug 7, 1944 y - Harvard Mark I and the IBM automatic Sequence Controlled Calculator (ASCC)
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Howard Aiken in collaboration with IBM, developed his first fully functional computer, known as the Harvard Mark I. The machine was huge: more than 50 feet (15 metres) long, weighing five tons, and consisting of about 750,000 separate parts, it was mostly mechanical. For input and output it used three paper-tape readers, two card readers, a card punch, and two typewriters. It took between three and six seconds to add two numbers.
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Part 2 History of the Computer
Nathan Izzo
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