Identify some of the main devices for inputting data into a computer such as: mouse, keyboard, trackball, scanner and more .
The Mouse
The mouse came into common use on a PC with the introduction of the Microsoft
Windows operating system. Before this, the operating system (DOS) would normallybe controlled via the keyboard. These days it is vital to be a competent mouseuser. There are many different types of mice, a commonly used model now has asmall wheel on it which when combined with the correct software allowsadditional functionally and fine control over the use of your applications.
The Keyboard
The keyboard is still the commonest way of
entering information into a computer. There are a number of different types,
including those specially designed for use with Microsoft Windows. The quality
of the keyboard is often overlooked when buying a PC; it should be robust and
easy to use.
Tracker Balls
A tracker ball is an alternative to the traditional
mouse and favored by graphic designers. Tracker balls often give much finer
control over the movement of the items on the screen. They may take a while to get used to if you are used to the traditional mouse, but offer a lot in terms
of added flexibility
Scanners
A scanner allows you to scan printed material and convert it into a file format
that may be used within the PC. You can scan pictures and then manipulate these inside the PC using a graphics application of your choice. In addition, you can scan printed text and convert this not just to a picture of the text but also
to, actual text that can be manipulated and edited as text within your
word-processor. There are a number of specialist programs, generically called
OCR (Optical Character Recognition) programs that are specifically designed for
converting printed text into editable text within your applications.
Touch Pads
A touch pad is a desktop device and responds to pressure. Used in conjunctionwith a special pen they can be used by graphic artists wishing to createoriginal, digital artwork.
Light Pens
A light pen is used to allow users to point to
areas on a screen and is often used to select menu choices.
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