Sunday, February 7, 2010

Output Devices

Output devices are hardware components which are used to display or print the processed information. We are discussing below the structure, working and uses of the common output devices are:


Visual Display Unit(VDU), commonly called as monitor is the main output devices of a computer. It consists of a Cathode Ray Tube(CTR), which displays characters as an output. It forms images from tiny dots called pixels, that are arranged in a rectangular form. The sharpness of the image (screen resolution) depends upon the number of pixels.

Types of monitors:

There are different kinds of monitors depending upon the number of pixels. Depending upon the resolution, monitors can be classified as follows.

a.CGA (Color Graphics Adapter).
b. MDA (Monochrome Display Adapter).
c. HGA (Hercules Display Adapter).
d. EGA (Enhanced Graphics Adapter).
e. VGA(Video Graphics Adapter).
(Super VGA).

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