Programs and data are entered into a computer through a keyboard which is attached to a microcomputer or the terminal of a mini or large computer. It contains alphabets, digits, special character and some control keys. When a key is pressed, an electronic signal is produced which is detected by an electronic circuit called keyboard encorder. A keyboard encorder may be a special IC or a single-chip microcomputer. The function of an encorder is to detect which key has been pressed and send a binary code to the computer. The binary code may be an ASCII , EBCDIC , or HEX code .
A typical computer keyboard contains all the letters, number , symbols of a regular typewriter , plus other keys which may include numeric keys, special keys like control movement.
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