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Computer Science. A Concise Introduction by Ian Sinclair (Auth.)

By Ian Sinclair (Auth.)

Covers the syllabus for urban and Guilds 424, utilizing the minimal of arithmetic, and together with feedback for sensible paintings, workouts and multiple-choice questions with solutions. it may fill the necessity for a textbook on machine technology that's according to hands-on event with microcomputers

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Extra resources for Computer Science. A Concise Introduction

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This calls for a higher level of skill on the part of operators which at present is not reflected in the salaries paid to operators, some of whom are carrying out the tasks that once were assigned to maintenance engineers or programmers. Exercise 3 Which of the following errors could easily be detected by a suitably programmed computer and which would probably require human intervention. (a) Today's date. (b) Name of a client. (c) Income-tax coding. (d) Post code of an address. (e) Day on which Christmas 1995 will fall.

Even a fast typist is unlikely to press keys at a rate faster than four or five per second, and a time of one-fifth second is vast by CPU standards, long enough to cycle through all of the memory. The scheme that is usually followed is to allow the CPU to concentrate on other tasks, and interrupt it when a key is pressed. At the interruption, the CPU then runs a small piece of program that will find which key has been pressed and place the code for that key into the CPU to be dealt with as the program requires.

1 The actions of reading and writing in a computer memory. Reading does not alter the content of memory, but writing replaces the older byte by the new one 44 Inside the machine are used for addressing, and then sixteen of these lines are switched over to be used for data. This technique requires more complicated connections between the CPU and the memory and is less common now that manufacturing processes have improved. Minicomputers and mainframes have much more choice about the use of address and data lines, and CPU sections with thirty-two lines of data and twenty-four or thirty-two lines of address have been used frequently in the design of these machines.

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