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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