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Sunday 19 January 2014

keyboard

The keyboard may look like a typewriter keypad to which some special keys have been added. The keys normally available on the keyboards are numeric,alphabetic,Function and additional special-purpose keys.Figure 1.2 shows the complete layout of an extended keyboard on a personal computer. It has some additional keys between the main keypad and the numeric keys, and status lights in the upper-right corner.This standard keyboard is also called QWERTY ,which describes the beginning keys in the top row of alphabetic letter.
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