Mouses. graphics tablets, trackballs

How do mouses, graphic tablets, trackballs work?? I would like to know how these devices are made and what the adv's and disadv's of them are!

Cheers


Melanie
Meltz_99Asked:
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DontPanicCommented:
Inside both mice and trackballs, there are two rollers that sense the horizontal and vertical movement of the ball.  This information is sent to a PS/2 or serial port on the computer, and a software driver decodes the information, and tells the operating system what the mouse is doing.
The main difference between a trackball and a mouse is user preference. (They both do the exact same thing).


I am not exactly sure about the grahic tablet, but usually they use a magnetic surface to detect the movement of the pointer. These devices are usually used when working with a complicated graphics design/presentation programs.

Mice and trackballs are more portable then a large graphic tablet, and unless the user was involved in a heavy amount of graphics design, a mouse or trackball would be best.
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Gryphon031198Commented:
Tablets works on pressure senistive plates.  If you move the pen, the pressure you apply tells the computer where the pointer should be on the screen.

Ditto on the mouse/trackball

Gryphon
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