Input Devices - Research Article from Macmillan Science Library: Computer Sciences

This encyclopedia article consists of approximately 4 pages of information about Input Devices.
This section contains 982 words
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Input Devices

The work of a computer can be characterized by an input-process-output model in which a program receives input from an input device, performs some processing on the input, and produces output to an output device. Users employ a variety of input devices to interact with the computer, but most user interfaces today are based upon a keyboard and a mouse pointing input device.

A keyboard consists of a number of switches and a keyboard controller. The keyboard controller is built into the keyboard itself. When a key is pushed, a signal called a scan code is sent to the controller. A different scan code is sent when the key is released. The use of two scan codes allows keys to be used in combination. The controller is able to tell whether a key is being held down while another key is struck, or to determine when...

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This section contains 982 words
(approx. 4 pages at 300 words per page)
Buy the Input Devices Encyclopedia Article
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Input Devices from Macmillan. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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