By A. J. Smith (auth.)

ISBN-10: 0333491610

ISBN-13: 9780333491614

ISBN-10: 134910857X

ISBN-13: 9781349108572

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Direct addressing of information is therefore possible by quoting the appropriate track/sector/block address. In large systems several disks may be mounted one above another on a common spindle and the resultant assembly is known as a disk 'pack'. 5. Fixed head drives As the name suggests the read/write heads in these units do not move, and it therefore follows that they need a separate read/write head for each track. The speed of access is thus very fast indeed, but they also tend to be the most expensive.

This system uses ribbon microphones positioned along the X and Y axes of the board and the signal is produced by a special pen which generates an ultra-sonic sound when pressed onto the board. Digitisers are available to accommodate A3, A2, A1 and AO size drawings, and smaller graphics tablets are available to accommodate A4 size sheets. The price increases rapidly wlth the size. Pressure pad and similar devices These devices usually consist of either a pressure pad or a solid state board similar to a digitiser.

160-165 Malcolm P. (1987a) 'Run around the clock' Personal Computer World February 1987 pp. 122-126 Malcolm P. (1987b) 'Caught in the net' Personal Computer World May 1987 pp. 134-138 Stobie I. 88 pp. 30-31 Toothill P. (1987) 'Clearing the line' Personal Computer WorldApril1987 pp. 174-176 Walker N. 12 (December 1986)pp. 164-167 Wharton (1987) Image processing Wharton Information Systems Widdeson P. (1980) Computers and Public Authorities Privately published 3 The Selection and Management of an Office Computer System Objectives At the end of this chapter you should be able to: • Discuss the factors to be considered when choosing an office computer system.

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