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1、Unit71．lInputdevicesarehardwareusedtotranslatewords,sounds,images,andactionsthatpeopleunderstandintoaformthatthesystemunitcanprocess.lOutputdevicestranslatesymbolsprocessedbythesystemunitintowords,sounds,images,andactionsthatpeopleunderstand.4．lOutputisprocessed
2、dataorinformation.Ittypicallytakestheformoftext,graphics,photos,audio,andvideo.lOutputdevicesareanyhardwareusedtoprovideortocreateoutput.Itwascombinedbyfaxmachines,multifunctionaldevices,Internettelephones,andterminals.(2).lFaxmachinesisastandardtoolinnearlyever
3、yoffice.lMultifunctionaldevicestypicallycombinethecapabilitiesofascanner,printer,fax,andcopymachine.lInternettelephonesarespecializedinputandoutputdevicesforreceivingandsendingvoicecommunicationlTerminalisaninputandoutputdevicethatconnectsyoutoamainframeorothert
4、ypeofcomputer.Unit8l2.(1)Therearethreetypesofharddisks:internalharddisk,hard-diskcartridge,andhard-diskpack.lAninternalharddiskislocatedinsidethesystemunitlHard-diskcartridgesareaseasytoremoveasacassettefromavideocassetterecorder*-lHard-diskpacksareremovablestor
5、agedevicesusedtostoremassiveamountsofinformation(2)Therewastoimprovetheperformanceofharddisksarediskcaching,redundantarraysofinexpensivedisks,andfilecompression.5．lMassstoragereferstothetremendousamountofsecondarystoragerequiredbylargeorganizations.lMassstoraged
6、evicesarespecializedhigh-capacitysecondarystoragedevicesdesignedtomeetorganizationaldemandsfordata.lMostlargeorganizationhaveestablishedastrategycalledanenterprisestoragesystemtopromoteefficientandsafeuseofdataacrossthenetworkswithintheirorganizations.Unit141.lp
7、rogramspecification:Theprogram’sobjectives,outputs,inputs,andprocessingrequirementsaredetermined.lProgramdesign:Asolutioniscreatedusingprogrammingtechniquessuchastop-downprogramdesign,pseudocode,flowcharts,andlogicstructures3)lProgramcode:Theprogramiswrittenorco
8、dedusingaprogramminglanguagelprogramtest:TheprogramistestedordebuggedbylookingforsyntaxandlogicerrorslProgramdocumentation:Documentationisanongoingprocessthroughoutth
