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1、Abstract1Acomputerisanelectronicdevicethatcanreceiveasetofinstructions,orprogram,andthencarryoutthisprogrambyperformingcalculationsonnumericaldataorbycompilingandcorrelatingotherformsofinformation.ThetypesofcomputersaremainlyinclusiveofMicrocomputer, Mic
2、rocomputer, Mainframe ComputerandSupercomputer, etc. Microminiaturization,theefforttocompressmorecircuitelementsintosmallerandsmallerchipspaceisbecomingthemajortrendincomputerdevelopment.Besides,researchersaretryingtodevelopmorepowerfulandmoreadva
3、ncedcomputers.计算机是一种能够接受一系列指令或程序，然后通过进行数值计算或者编译和联系其他形式信息的来进行处理的设备。计算机的类型包括微电脑，微机、大型计算机和超型计算机等。计算机微型化，就是通过把更多的电子元件压缩变成越来越小的芯片，这是电脑发展的趋势。除此之外，研究人员正在尝试开发功能更强大，更先进的计算机。Abstract2SecondarymemoryhastwofeaturesthatcannotbeprovidedbyRAMmemory.First,whileRAMmemorym
4、aynotbelargeenoughtoholdallofthedatathataprogramneeds,secondarystoragecanbearbitrarilylarge.Secondarystorageisafastaccurate,inexpensive,high-capacity,nonvolatileextensionofmainmemory.Theleastexpensiveofthesecondarystoragemediaismagneticcassette.Themostcom
5、monmicrocomputersecondarystoragemediumisdisketteorfloppydisk.Datastoredonharddiskcanbeaccessedfarmorerapidlythandatastoredondiskette.Andharddiskstoragecapacityisconsiderablylarge.Anopticaldiskcanhold650megabytesofdata,theequivalentofhundredsoffloppydisks.
6、Moreover,anopticaldiskmakesanimmenseamountofinformationavailableonamicrocomputer.CD-ROM,WORM,ErasableOpticalDisksarebecomingpopularbecauseoflargecapacityandflexibility.U-diskisanewhightechproduct,whichhasattractedtheworld’sattention.辅助存贮器有两个特征是随机存取内存不能提供的
7、。首先，随机存取内存没有足够大的空间容纳一个程序的数据；其次，二级缓存的大小不定。二级缓存是主内存的一个快捷、廉价、高容量的长期的扩展。最便宜的二级存储介质是磁性卡式磁带.微机最常见的二级存储介质是磁盘或软盘。存储到硬盘的数据访问起来比存储在软盘的数据快。因为硬盘存储容量是相当大的。一张光盘可容纳650兆字节的数据,相当于数百张磁盘的容量。此外,光盘极大地增加了微型机算计的信息容量。光盘驱动器,蠕虫,可擦写的光盘由于其容量大和灵活性变得大受欢迎。U盘是一种新的高科技产品,已经引起了全世界的注意。Abstr
8、act3PCsgavetheworldawholenewwaytowork,playandcommunicate.ThePC-pluserawillberevolutionary.Computerswilltakemanyforms,buttherewillalwaysbeaplacefortheall-purposemachinewe’vecomeondependon.Combinedigitaltechnologywith
