now use infrared or wireless links to the computer, which removes the need to have a connecting cable.
· It is easy and convenient to use
· Most modern software includes an option to use it.
· It selects a position on the screen more quickly than is possible with a keyboard.
· It cannot be used to input text easily- you still need a keyboard to do that.
· It is relatively slow for selecting options from menus. A user who is familiar with the software can select options more quickly with the keys.
· It is not very accurate for drawing purposes
· The mouse requires a flat surface to operate
Keyboard is the most important and commonly used input device. A keyboard consist of following four areas:
1. Function keys (F1- F12, Print Scan, Scroll lock, Pause Break), which is the top row of the keyboards.
2. Main section (A-Z, Symbols, and some function keys)
3. Numeric keypad, which is on the right.
4. Courser movement and editing keys, which locate between the main section key and numeric keypad.
When we press a key on the keyboard the key sends an electronic signal that will be interpreted as a character of function by the computer processor.
The question is asked that why the letters on a keyboard are not alphabetically arranged the answer to this question is that in the past the processors of the computers were very slow they could not handle too much data at once so to slow down the speed of the typists they created a standard layout called QWERTY which comes from the six keys on the top row of the alphabetical character.
Now days different types of keyboards are available in the market to meet the needs of the users for example ergonomic keyboard is more efficient for those users who suffer from the strain injury or for those who use a keyboard for long period of time.
· They are very reliable. Other
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