Keyboards

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Term Paper Title	Keyboards
# of Words	2568
# of Pages (250 words per page double spaced)	10.27

Keyboards

A key board is simply a way that the user may interface a fixed number of commands (equal to the number of keys that the manufacturer places on the board). The standard keyboard for home PCs is a QWERTY key board, but they are not restricted to this format as in industry they can be used to send different common commands to a computer for example a farm may have a key board controlling the environmental setting in the sheds with a button to dim the lights or turn them up or a button to turn on the water supplies.
The keys on a QWERTY keyboard will work in two different way.

Captive key: When this key is pushed a plunger is pressed down allowing a current to flow across a pad.

Hard contact: When the key is pressed to conectors are pressed together forming a physical conection creating a current.

The key board has in side it a small microprocessor this will scan the keyboard once every millisecond to check for changes in the current when the key is pressed the processor finds that the current has increased and reacts accordingly and the same when the current is depressed and the current decreases.
Over the years many new types of keyboard have been thought up these are mostly more ergonomically designed than there older counter parts this is done in order to reduce R.S.I a problem that effects a lot of typists
One of the most interesting keyboard is a device called a data hand this will take a combination of hand movement and clicks and convert them in to working commands.
Another type of keyboard is the virtual keyboard this removes the physical keyboard and replaces it will a digital interpretation that the user can interact with this is most popular with machines too small to use a standard keyboard such as palmtop computers.

Mice

A mouse is a way of removing the clumsy use of a keyboard a mouse’s primary function is to convert movement of the mouse ball to movement of the on screen pointer making computer use quicker and simpler.
Mice have opened up mass of programs moving us away from user unfriendly operating systems such as MS DOS to systems such as windows where users can perform functions by simply clicking or double clicking on icons representing the file.
A mouse works in a number of steps.

1. As the mouse ball is pushed it rotates
2. When it turns the mouse ball pushes two rollers one controlling the vertical movement and the other the horizontal.
3. The rollers rotate two wheels known as encoders the...

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