Another possibility is that Compac is not fully implementing all of
the LPT pins.
I had a Gateway laptop that would not work with a certain model of
keyer interface. Using a breakout box, I supplied an external
voltage to two of the keyer interface pins (where the LPT port would
provide power) -- This overcame the problem. The keyer interface
was one that used opto-isolators. On the other hand, the Gateway
system drove a simple transistor based interface with no problem.
I have a new Dell system that does not require the breakout box,
with the same model of keying interface.
Good luck & 73,
Dave AG8L
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