(Bart T.) wrote in message . com...
Hi,

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My schematic is at: http://www.trzy.org/pport.jpg

Is the ground of your circuit tied to the parallel port ground? They
must be tied together for this to work.

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2. I disconnected the 165's output from the parallel port and then,
when the output was 0, I made a connection to +Vcc (+6V in my set up.)

Change your VCC supply to +5V. Although the HC165 can handle +6V, it
is at the high end of the spec. In addition, with a 6V VCC, the
logic output high level is too high for TTL inputs.