generations of computers

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  • Created by: maxullman
  • Created on: 26-01-15 13:23
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  • computers
    • 1st generation
      • examples
        • colossus 2nd world war
          • thermostatic valves
          • input =holes in paper tape
            • output = printer
          • british
        • ENIAC
          • general purpose
          • USA
          • 27 tonnes 64 sq meters
          • plugs and wires
          • slow and unreliable to use
          • military uses
      • must be programable
        • program is set of instructions
        • has input and output
          • this is the DATA
      • electronics
        • switches on /off
          • binary 0 or 1
    • 2nd generation
      • transistors
        • silicon crystal used as switch by blocking or allowing electrical conduction
        • much smaller than valves
        • less power consumption
        • quicker
        • cheaper and more reliable
      • large mainframes
        • 64000 dollars
      • mini computers
        • size of wardrobe
          • screens and keyboards
        • 16000 dollars
        • small businesses
        • early 60's
    • 3rd generation
      • integrated circuit (silicon chip)
        • seeral components integrated on same crystal
      • quicker and cheaper and smaller
      • keyboards and monitors
      • multiple terminals to one computer
      • forms on screen for data entry
      • floppy disc
        • programs and data portable
    • 4th generation
      • the start of PC's personal computing is born
      • 1970's
      • micro processors
        • single integrated circuit
          • central processing unit
            • manages storage, retrival of data and processes instructions
      • can manufacture large numbers
      • refining of systems

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