Although the keyboard and mouse are the input devices that people use most often, several additional ways of getting data into a computer are available. Sometimes the tool is simply a matter of choice. Some users just prefer the feel of a trackball over a mouse. In many cases , however, an ordinary input device may not be appropriate. For example , in a dusty factory or warehouse, a keyboard or mouse can become clogged with dirt quickly. It takes time for grocery cashiers to input product codes and prices manually, so optical scanning devices are often used to speed the process and reduce the risk of input errors.
Alternative input devices are important parts of some special purpose computers. Tapping an H/PC's screen with an electronic pen is much faster way to input commands than typing on a miniature keyboard. On the other hand, a specialized device can give new purpose to a standard system. If you want to play action packed games on your home PC, for example, you will have more fun if you use a joy stick or game controller than a standard keyboard or mouse.
This lesson examines several categories of alternative input devices and discusses the special uses of each. you may be surprised at how often you see these devices, and you may decide that an alternative device will be your primary means of interacting with your computer.
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