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To get data and instructions moving among the various components of the system,the computer needs a date bus,The wider the bus ,the more date it can move at one time.
The cycle that the computer goes through to fetch and execute one instruction is called the machine cycle.In the instruction cycle part of the machine cycle,an instruction is retrieved from main memory and is decoded in the CPU.The time it takes to do this is called I-time.In the execution cycle,the instruction is executed and the result is stored. The time this takes is called E-time.An internal clock in the CPU sets the speed of the machine cycle,which is measured in MHz-megahertzl,or millions of cycles per second.
A computer system could not operate without main memory,also called internal memory,primary memory, primary storage,random access memory (RAM),or simply memory.In general,main memory is used(1)tostore a copy of the main software program that controls the general operation of the computer;(2)to store a copy of the business application softwareyou are using;(3)to temporarily store data that has been input from the keyboard or other storage device until it is ready for processing;and(4)to temporarily store data that has been produced as a result of process until it is ready for output or secondary storage.
In a microcomputer,main memory,or RAM,chips are often found in banks of eight or nine on the motherboard.A character`s 8 bits are stored in a row of chips;the ninth chip holds the parity bit,which is a 1 or 0,based on whether the parity scheme is odd or even.The parity scheme is used to check for errors produced by interference with the electrical current.
If you have a microcomputer that needs to have its RAM expanded beyond 640 K to handle new types of software,you can purchase additional memory,often in the form of an expanded memory board,to"plug in"to the motherboard.
The cycle that the computer goes through to fetch and execute one instruction is called the machine cycle.In the instruction cycle part of the machine cycle,an instruction is retrieved from main memory and is decoded in the CPU.The time it takes to do this is called I-time.In the execution cycle,the instruction is executed and the result is stored. The time this takes is called E-time.An internal clock in the CPU sets the speed of the machine cycle,which is measured in MHz-megahertzl,or millions of cycles per second.
A computer system could not operate without main memory,also called internal memory,primary memory, primary storage,random access memory (RAM),or simply memory.In general,main memory is used(1)tostore a copy of the main software program that controls the general operation of the computer;(2)to store a copy of the business application softwareyou are using;(3)to temporarily store data that has been input from the keyboard or other storage device until it is ready for processing;and(4)to temporarily store data that has been produced as a result of process until it is ready for output or secondary storage.
In a microcomputer,main memory,or RAM,chips are often found in banks of eight or nine on the motherboard.A character`s 8 bits are stored in a row of chips;the ninth chip holds the parity bit,which is a 1 or 0,based on whether the parity scheme is odd or even.The parity scheme is used to check for errors produced by interference with the electrical current.
If you have a microcomputer that needs to have its RAM expanded beyond 640 K to handle new types of software,you can purchase additional memory,often in the form of an expanded memory board,to"plug in"to the motherboard.
得到数据和指示行动在系统的各种各样的组分之中,计算机需要日期公共汽车,更宽公共汽车,更多日期它可能一次行动。
周期, 计算机经历拿来和执行一指示叫机器周期。在机器周期的指令周期部分,指示被检索从主存储器和被解码在CPU 。它采取做这的时间叫我时间。在施行周期,指示被执行并且结果被存放。 这需要的时间叫E 时间。一个内部时钟在CPU 设置机器周期的速度,哪些被测量用兆赫megahertzl,或成千上万转每秒。
计算机系统不能经营没有主存储器,并且叫的内存,主存储器, 主要存贮,随机存取存储装置(RAM),或简单地记忆。总之,主存储器是used(1)tostore 每控制计算机的一般操作主要软件程序的拷贝;(2)to 商业应用softwareyou 的拷贝使用的商店;(3)to 临时被输入了从键盘或其它存贮设备的商店数据直到它准备好处理;and(4)to 临时导致了由于过程的商店数据直到它准备好产品或间接储藏。
在微型计算机,主存储器,或RAM,芯片在银行八或九中经常被发现在主板。character`s 8 位连续被存放芯片;第九块芯片拿着同等位,哪些是1 或0,根据是否同等计划是奇怪的甚至。同等计划使用检查错误由干涉导致以电流。
如果您有需要有它的RAM 被扩展在640 K 之外处理软件的新型的一台微型计算机,您能购买另外的记忆,经常以一个扩充内存委员会的形式,to"plug in"to 主板。