CHAPTER 4 The Components of the System Unit1. The System Unit 课件

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1、CHAPTER4TheComponentsoftheSystemUnittheSystemUnit2SystemUnitTypes（系统单元类型）SystemUnitHouseselectroniccomponentsBasiccomponentsSystemboardMicroprocessorMemoryExpansioncardsExpansionslotsTypesofSystemUnitsDesktopNotebookTabletPCPersonalDigitalAssistant3DesktopUnits（台式机）Non-portable非移动式Input/Outpu

2、tdeviceslocatedoutsidethesystemcabinet输入输出设备位于系统箱外4NotebookUnit（笔记本）PortableMonitorattachedbyhinges显示器可开合Keyboardandpointingdevicesintegraltothesystemunit键盘和指示设备集成于系统单元5TabletPCsystemunit（平板电脑）Similartonotebook与笔记本相似Highlyportable高移动性Supporttheuseofastylusorpen支持记录笔6PDAUnits（掌上电脑）Smallestsyst

3、emunitAllinput/outputandsecondarystoragedevicesintegraltothesystemunit7ElectronicData&Instructions（电子数据和指令）BinarySystem0sand1sEach0or1isabit8bits=1byte8BinaryCodingScheme（二进制编码方案）AmericanStandardCodeforInformationInterchange(ASCII)ExtendedBinaryCodedDecimalInterchangeCode(EBCDIC)Unicode9ASCI

4、I（美国信息交换标准码）Widelyusedinmicrocomputers1byte=1characterExamplesLetterRisrepresentedby01010010Number3isrepresentedby00110011Character%isrepresentedby0010010110EBCDIC（扩充二进制编码的十进制交换码）DevelopedbyIBMUsedinmainframecomputers1byte=1characterExamplesLetterRisrepresentedby11011001Number3isrepresentedby

5、11110011Character%isrepresentedby0110110011Unicode（统一字符编码标准）DevelopedbyUnicode,Inc.withsupportfromApple,IBM,andMicrosoftUsedtosupportinternationallanguagessuchasJapaneseandChinese2bytes=1character12SystemBoard（系统板）Connectsallcomponents连接所有部件Datapathbetweendevices设备间的数据通道Alsocalledthemainboard

6、ormotherboard也叫主板13SystemBoardComponents（组成）Sockets插孔Connectionpointsforsmallspecializedelectronicparts小电子部件的连接点Chips芯片Tinycircuitboardsetchedintosiliconwafer蚀刻成电路板后的硅晶片CarrierPackage芯片封装后的集成电路块Slotconnectionpointforspecializedcardsorcircuitboards14Microprocessor（微处理器）The“brains”ofthecomputer

7、systemLocationoftheCentralProcessingUnit(CPU)Chipcapacityexpressedinwordsize16bit,32bit,64bitLargerthewordsizefasterthecomputer15CPU（中央处理器）ControlunitDirectsthemovementofelectronicsignalsbetweenmemoryandtheALUArithmetic-logicunit(ALU)Arithme