John,

I was going from the doc the first time and realized I missed a 10K, in
measuring it, I see that it is in fact 20K. Everything off the P2 connector
is identical since I connected to the other machine. I even went so far as
to move the control panel so that I could use the same 6' cable used when
tested against the other machine.

There were some minor changes to the I/O on P3, all of which is working. But
I could try disconnecting that tomorrow to see if there is any way it could
be making a difference. I will try your suggestions then too.

Thanks,
Eric

My guess is that adding more power to the 5V rail won't make a huge
difference. 

If a "supposedly identical" system works and this system doesn't, then
they are NOT identical.   Find the difference between the two systems
and you will have found the answer.  Maybe a wiring error, maybe the 10K
isn't 10K on this system, any number of possibilities.

Try the divide and conquer approach:  Disconnect the entire external system
and hook up a simple 10K load resistor.  If that makes it droop, it is a
board (or power) problem.  If not, then it must be something about your
external system.




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