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KEYBOARD Definition We define KEYBOARD KEYBOARD - The main input device on most PCs. It consists of a "board" with a set of buttons on it that represent all the letters in the alphabet, the numbers 0 through 9, and any extra keys, like cursor keys and function keys, that enable some keys to represent additional characters. # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z