... devices enable the user to enter data, commands and programmes into the computers central processing unit (CPU) - its brain. There are many such input devices, but some of the most common ones are: * Keyboard * Mouse * Rollerball * Scanner * Digital camera * Microphone * Joystick. Keyboard The keyboard is the most commonly used input device and is used to key in data or to enter commands to the computer. The great majority of keyboards follow the standard IBM layout and design. Touching or pressing a key sends an electrical signal to the computer which interprets it as a character or function. The keyboard is divided into four main areas: * Function keys across the top * Letter keys in the main section * A numeric keypad on the right * Cursor movement and editing keys between the main section and the numeric keypad. A computer keyboard is almost the same as a typewriter, apart from a few extra keys and specialised ...

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