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COMPUTERS OF THE PAST. By Leif Fossmo. THE VACUUM TUBE (1951-1958). Created in 1947 by Mauchly and Eckert, called the ENIAC Used to calculate the U.S. census Small electronic tubes the size of lightbulbs were used to calculate data

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Computers of the past

COMPUTERS OF THE PAST

By Leif Fossmo


The vacuum tube 1951 1958
THE VACUUM TUBE (1951-1958)

  • Created in 1947 by Mauchly and Eckert, called the ENIAC

  • Used to calculate the U.S. census

  • Small electronic tubes the size of lightbulbs were used to calculate data

  • Magnetic cores consisting of tiny donut-shaped rings which were strung on intersecting wires provided memory, until 1957 when magnetic tape was created

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The transistor 1959 1964
THE TRANSISTOR (1959-1964)

  • Small device that transfers electonic signals across a resistor, created in 1947 by John Bardeen, Walter H. Brattain, and William Shockley

  • Revolutionized electronics, computers in particular

  • Much smaller than vacuum tubes, needed no warm-up time, consumed less energy, generated less heat, more reliable

  • Incorporated into computers in the late 1950s

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The integrated circuit 1965 1970
THE INTEGRATED CIRCUIT (1965-1970)

  • Complete electronic circuit on a small chip of silicon

  • Silicon is one of the earth’s most abundant elements and is found in common beach sand as well as almost all rocks and clay

  • Silicon is a crystaline substance that conducts an electric current when it has been doped with chemical impurities

  • IBM 360 series was the first to take advantage of these new integrated circuits

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The microprocessor 1971 now
THE MICROPROCESSOR (1971-NOW)

  • Microprocessor became the evolved form of the integrated circuit

  • Became commercially available in 1971

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