Lesson 3 Data processing
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Transcript of Lesson 3 Data processing
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Lesson3
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3‐1TheHistoryofComputers3‐2TheEarliestComputingDevices 1.Abacus 2.Napier’sBones 3.Oughtred’ssliderule
4.Pascal’sCalculator 5.Leibnir’sCalculator 6.Babbage’sanalyticalEngine
7.Hollerith’sPunched‐cardMachine
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Historicalrecordswilltellusthatmanhasinventedthreetypesofdevicestoassisthimincalculatingandprocessingdata.Theyare: Manualmechanical Eletromechanical Electronic
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Manual‐mechanical:Asimplemechanismpoweredbyhand Abacus Sliderule
Electromechanical:Itisusuallypoweredbyanelectricmotorandusesswitchesandrelays. Householdelectricalappliances Calculators Punchedcards
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Electronic:adevicewhichhasitsprincipalcomponentscircuitboards,transistorsorsiliconchipsandthelike Moderndigitalcomputer
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3‐2TheEarliestComputingDevices
1. Abacus
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3‐2TheEarliestComputingDevices
2. Napier’sBones
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3‐2TheEarliestComputingDevices
3.Oughtred’sSlideRule
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3‐2TheEarliestComputingDevices
4.Pascal’sCalculator
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3‐2TheEarliestComputingDevices
5.Leibniz’sCalculator
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3‐2TheEarliestComputingDevices
6.Babbage’sAnalyticalCalculator
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3‐2TheEarliestComputingDevices
7.Hollerith’sPunched‐cardMachine