Dear All,

Now that I've managed to operate the parallel port, I'm now trying to
read in logic from the outside world.

To obtain the pure logic value, all zeros must be written to the data
register before reading. The only way I can get a proper logic read is if
I supply +5V directly to the port pins. If I tie the PIC directly to the
pins, it begins to get very hot.......whoops. Does anybody have any ideas
on how I can get the logic through using a PIC16C74?

Thanks.

J.W.

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        Johnnie Walker
        MSc Digital Systems Engineering
        Heriot-Watt University
        email: ceejbcw@cee.hw.ac.uk
               ceejbw@pp.hw.ac.uk
               ceejbw@torduff.hw.ac.uk
        www: http://www.cee.hw.ac.uk/~ceejbcw
        tel: (0131) 343 2864
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