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ID:40081285
大小:4.89 MB
页数:97页
时间:2019-07-20
《I NPUT AND OUTPUT DEVICES 1 》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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