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Unit I: Introduction to Computer System
1 COMPUTER SYSTEMS
INTRODUCTION TO
Chapter Outline
1.1nEvolutonnofn oomutngnDtvictyn 1.2n PU
1.3nInmutnDtvictyn 1.4nOutmutnDtvicty
1.5nMtoorSnUnitn 1.6nDatan amturing,n toragt,nandnRttritval
1.7n oftwart
Introduction
oomutngnttchnologSnhayniomacttdnalooytntvtrSnfacttnofnournlift.nExaomltynofncoomutngnttchnologSnincludtncrtatngn
andocuotnt,noakingnanmrtytntatonnonnanmrojtctnthatnSounhavtndtvtlomtdnfornancouryt,nyhommingnonnannt-coootrctn
yitt,noanagingninvtntorSninnanytort,nt-ltarning,nwatchingnanvidtononnYouTubt,nbookingnantckttnfornantrainnornanflight,n n
otdicalndiagnoyiynandntrtatotnt,noainttnanctnofnotdicalnrtcordy,nandnotanynofntnttrtainotntnliktnoakingnofnfiloy,n
vidtongaoty,nandnmuzzlty,noakingnanhottlnrtytrvaton,nanmhontncallnonnSournoobilt,nornonlintnmaSotntnofnbilly.nThuy,n
thtncoomuttrnhaynbtcootnanninttgralnmartnofnournlivty.n
Now,nbtingnawartnofnyonoanSnammlicatonynofncoomuttry,ncannSounfindnangtntricnanywtrntonthtnfollowingnqutyton,n
whichnammlityntonallnthtnammlicatonynotntontdnabovt:nWhatndotynancoomuttrndo?nWtll,nthtnanywtrniynyiomlt:nitn
mroductynanuytfulnoutmutnfornuy.nForntxaomlt,nSounoaSnbtninttrtyttdntonyttnonnancoomuttrnthtnavtragtnoarkynofn
ytudtntyninnanclayy,nornSounoaSnliktntondtyignnanmaintngnandnmrintnitnonnmamtrnuyingnancolournmrinttr,nornSounoaSnwantn
tonliyttnntonthtnouyicnofnSournmrtftrrtdntSmtnonnanoobilt,nornSounoaSnliktnthtnbrooonofnanrobotntoncltannthtnfloor.n
o,ntonmroductnanuytfulnoutmutnfornuy,nancoomuttrnouytnhavtnannoutmutnunitnthatncanndtlivtrnthtndtyirtdnoutmutnonn
anyuitabltndtvict,ncalltdnannoutmutndtvict.nThuy,nanoonitornthatndiymlaSynthtnavtragtnoarkynofnytudtntyninnanclayy,n
anmrinttrnthatnmrintynanmaintngnonnmamtr,nornthtnymtaktrnofnanoobiltnmhontnthatnmlaSynournfavourittnouyic,nartn
txaomltynofnoutmutndtvicty.nTonmroductnyootthingnuytful,nwtnouytnbtnabltntongivtninytructonyntonthtncoomuttr.n
Tontaktnthtytninytructonynfroonuy,nitnouytnhavtnanninmutnunit.nFurthtr,nancoomuttrnouytnbtnabltntonmroctyynourn
inytructony.nHtnct,nitnouytnhavtnanmroctyyingnunit.nWhiltnmroctyying,nthtndatanandninytructonynouytnbtnytortdn
yootwhtrt.n o,nancoomuttrnouytnhavtnanotoorSnunit.
Nownwtnrtcogniytnthatnancoomuttrnmroductynuytfulnoutmutynfornuy.nButnwtncannotntxmtctnancoomuttrntonmroductn
an uytfuln outmutn withoutn inttractngn withn it.n o,n thtrtn ouytn btn an otchaniyon ton givtn inytructonyn ton an coomuttr.n
Ton taktn thtytn inytructonyn froon uy,n itn ouytn havtn ann inmutn unit.n An ktSboardn iyn thtn ooytn coooonn txaomltn ofn
ann inmutn dtvict.n Furthtr,n btfortn mroducingn ann outmut,n an coomuttrn ouytn btn abltn ton mroctyyn ourn inytructony.n
Introductonnton oomuttrn Syttoy 1

