On Thu, 13 Mar 2003 08:03:15 -0600 George Fremin III <geoiii@kkn.net>
writes:
> Some computers do not have a pull-up resistor on the
> parallel port
> inputs. It might be necessary to provide pull-ups to +5
> Volts on the
> two inputs used by the paddle. This can be done by
> connecting a 10K
> resistor from each paddle input to pin 14 on the parallel
> port
> connector. Pin 14 is held at +5 volts and will pull the
> inputs up to a
> high logic level when the paddle input is open.
You can also supply the +5 volts from an external supply.
This frees up pin 14 to be used as a relay control port.
Dave Hachadorian, K6LL
Yuma, AZ
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