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    188宝金博页面版: 计算机英语 第2版 习题答案 作者 司爱侠 张强华 参考答案v3

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    内容提示： 185 附录 参考答案 Unit 1 〖Ex. 1 〗 根据课文内容回答问题 (1) A general-purpose computer has four main sections. They are the arithmetic and logic unit (ALU), the control unit, the memory, and the input and output devices, collectively termed I/O. They are interconnected by busses, often made of groups of wires. (2) The control unit is often called a control system or central controller. (3) ● Read the code for the next instruction from the cell indicated by the program counter. ● Decode th...

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    185 附录 参考答案 Unit 1 〖Ex. 1 〗 根据课文内容回答问题 (1) A general-purpose computer has four main sections. They are the arithmetic and logic unit (ALU), the control unit, the memory, and the input and output devices, collectively termed I/O. They are interconnected by busses, often made of groups of wires. (2) The control unit is often called a control system or central controller. (3) ● Read the code for the next instruction from the cell indicated by the program counter. ● Decode the numerical code for the instruction into a set of commands or signals for each of the other systems. ● Increment the program counter so it points to the next instruction. ● Read whatever data the instruction requires from cells in memory, or perhaps from an input device. The location of this required data is typically stored within the instruction code. ● Provide the necessary data to an ALU or register. ● If the instruction requires an ALU or specialized hardware to complete, instruct the hardware to perform the requested operation. ● Write the result from the ALU back to a memory location or to a register or perhaps an output device. ● Jump back to the first step. (4) The two classes of operations ALU is capable of performing are arithmetic and logic. (5) Logic operations involve Boolean logic: AND, OR, XOR and NOT. (6) A computer's memory can be viewed as a list of cells into which numbers can be placed or read. Each cell has a numbered "address" and can store a single number. (7) The two principal varieties of computer main memory are random access memory or RAM and read-only memory or ROM. (8) In a PC, the specialized program called the BIOS orchestrates loading the computer's operating system from the hard disk drive into RAM whenever the computer is turned on or reset. (9) Software that is stored in ROM is often called firmware because it is notionally more like hardware than software.

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