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 Posté le: 27/06/2009 07:59:20 Sujet du message: Le premier ordinateur date de 1936 |
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1936 Harvard Mark I Mainframe Computer
| Citation: | | It all began in 1936, when Howard Aiken, a Harvard researcher, was trying to work through a problem relating to the design of vacuum tubes (a little ironic, as you will see). In order to make progress, he needed to solve a set of non-linear equations, and there was nothing available that could do it for him. Aiken proposed to Harvard researchers there that they build a large-scale calculator that could solve these problems. His request was not well-received. |
1939 ABC Atanasoff Berry Mainframe Computer
| Citation: | | Although it was electronic, the computer's parts were very different than what is used today. In fact, transistors and integrated circuits are required just to have the same building blocks. They did not exist in 1939 when John Atanasoff received funding to build a prototype, so he used what was available at the time: vacuum tubes. Vacuum tubes could amplify signals and act as switches, so they could thus be used to create logic circuits. However, they used a lot of power, got very hot, and were very unreliable. These were tradeoffs he and others had to live with and were unfortunate characteristics of the computers built from them. |
1946 ENIAC Mainframe Computer
| Citation: | However, World War II ended before the machine was completed. When finished in 1946, this 30-ton monstrosity consisted of 49-ft. high cabinets, 18,000 vacuum tubes, 1,500 relays, 70,000 resistors, 10,000 capacitors, and 6,000 manual switches, and it consumed 200 kilowatts. Although finished after the war, it hardly proved useless. Capable of 5,000 additions, 357 multiplications, or 38 divisions per second, the performance of this machine was incredible. Problems that took a human mathematician 20 hours to solve, took only 30 seconds for the ENIAC.
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Le reste de l'histoire des ordinateurs
http://www.tomshardware.com/picturestory/508-mainframe-computer-history.htm… |
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