Output Devices 1

Identify common outputdevices for displaying the results of processing carried out by a computer, suchas: monitors, screens, printers, plotters, speakers. Know where these devicesare used.

The VDU (computer monitor or screen)

The VDU (Visual Display Unit) is the computer
screen used for outputting information in an understandable format for humans.
Remember that at the end of the day the computer works in binary code (a series
of on/off impulses). It is hard to realize that the original electronic
computers did not have a screen

Flat screen monitors

Traditional computer monitors are based on the same sort of technology that is
used within a television screen.

More recently, flat screen computer monitors have become available. These take
up a lot less room on a desk and use less energy than the traditional, more
bulky monitors.

Screen size

You should be aware that often if you specify a screen of a certain size, say a
17-inch screen, that this is the size measured diagonally, not horizontally
across the screen. If you are upgrading you should also ask for the "visible
viewing area" of the screen.

Graphics for games

Many games require very advanced graphics cards (boards) to be installed within
your computer to make them run. These advanced graphics cards contain their own
CPU that is dedicated purely to displaying the graphics on your screen. You
should find that a recent PC has this advanced graphics capability built-in
where as PCs from only 2-3 years ago may not.

Computer presentation projection devices

These are projection devices that can be attached to your computer and are
useful for displaying presentations to a group of people. They are best used in
combination with presentation programs, such as Microsoft PowerPoint. They are
used within education and are also very popular for sales presentations. The
price of these devices has dropped dramatically recently. When purchasing one of
these devices the two things to look out for are the resolution
(go for a minimum of XGA) and the brightness of the lamp (the brighter the
better). Other factors to be aware of is the quietness (or otherwise of the
device) and well as the cost of replacement bulbs.