I NPUT AND OUTPUT DEVICES 1

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1、Form3ComputerStudiesINPUTANDOUTPUTDEVICES1.AnOverviewofInputandOutputDevicesInput,OutputandSecondaryStorageDevicesarecollectivelyknownasperipheralsTheprocessororCentralProcessingUnit(CPU)makesallthecalculationsofthecomputer.Inorderforaprocesstobepossibleweneedtofeedi

2、ndatatothecomputerthroughtheinputdevices.Thecomputerwillthenprocessthedataaccordingtoaparticularprogramandfinallydeliverinformationthroughtheoutputdevices.Iftheinformationproducedneedstobestoredforthefuture,wewillstorethisintoasecondarystorageperipheraldevice.InputCo

3、mputerOutputDeviceDeviceINPUTPROCESSOUTPUT-Page1-Form3ComputerStudiesInputandOutputDevicesExamples-Page2-Form3ComputerStudies<>Inputdevicesareallthosehardwareequipmentthatareusedtoenterdataintothecomputer.KeyboardThisisthemostcommonandwidelyusedinputdev

4、ice.TherearedifferenttypesofkeyboardsbuttheQWERTYkeyboardisthemostwidelyused.Apartfromthenormalalphabeticalkeys,thekeyboardhas:-ANumericKeypad-NavigationKeys-FunctionKeysFunctionkeyschangefunctionusedaccordingtotheapplicationbeingused.MouseorTrackballThesecondmostcom

5、monlyusedinputdeviceisthemouse.Themousehelpstheusertopointandaccessitemsonthecomputer.Itsmainfunctionistocontrolthecursororpointeronthecomputer’sscreen.Themousecanhave2or3buttons,usedaccordingtothesoftwareapplicationbeingused.Today,mostmicealsohaveascrollwheelwhichis

6、usedmainlytoscrollthroughdocuments.-Page3-Form3ComputerStudiesThetrackballhasthesamebasicfunctionsofthemouse.Theonlydifferenceisthatthetrackballisstationaryandonedoesn’tneedtomoveitonamousepad.Inordertonavigatewiththepointer,theusermustmoveaballsituatedatthetopofthed

7、evice.Similartothemouse,thetrackballhas2or3buttonsusedtoselectitemsfromthescreen.TouchpadThisisasmallsensitivepadusedonportablecomputers(laptops).Thetouchpadisusedasapointingdevice.Thepointerismovedonscreenbytouchingthetouchpadwiththefinger.Tappingonthetouchpadwillgi

8、vethesameresultsaswhenusingthemousebuttons.Thetouchpadisparticularlyusefulforpersonswithdisabilitywhomcanhavelimitationsinmovingthe