Lesson 3 Data processing

Lesson3

3‐1TheHistoryofComputers3‐2TheEarliestComputingDevices 1.Abacus 2.Napier’sBones 3.Oughtred’ssliderule

4.Pascal’sCalculator 5.Leibnir’sCalculator 6.Babbage’sanalyticalEngine

7.Hollerith’sPunched‐cardMachine

  Historicalrecordswilltellusthatmanhasinventedthreetypesofdevicestoassisthimincalculatingandprocessingdata.Theyare: Manualmechanical  Eletromechanical  Electronic

  Manual‐mechanical:Asimplemechanismpoweredbyhand  Abacus  Sliderule

  Electromechanical:Itisusuallypoweredbyanelectricmotorandusesswitchesandrelays.  Householdelectricalappliances  Calculators  Punchedcards

  Electronic:adevicewhichhasitsprincipalcomponentscircuitboards,transistorsorsiliconchipsandthelike Moderndigitalcomputer

3‐2TheEarliestComputingDevices

1.  Abacus

3‐2TheEarliestComputingDevices

2.  Napier’sBones

3‐2TheEarliestComputingDevices

3.Oughtred’sSlideRule

3‐2TheEarliestComputingDevices

4.Pascal’sCalculator

3‐2TheEarliestComputingDevices

5.Leibniz’sCalculator

3‐2TheEarliestComputingDevices

6.Babbage’sAnalyticalCalculator

3‐2TheEarliestComputingDevices

7.Hollerith’sPunched‐cardMachine