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Centronics input/output interface

Centronics input/output interface
The Centronics interface available on almost any IBM PC or compatible lends itself to simple input/ output functions provided the drive capacity of the output lines is considerably boosted. In principle, the five inputs on the Centronics interface can be used straight away because they are ITL compatible. However, for added security, a resistor and a voltage limiting zener diode may be hooked up as shown here.
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