>I am having trouble with a HP 7475a pen plotter, and I don't know if it
>is a software or mechanical problem.

You do not say what the nature of the problem is, but if the plotter seems
completely dead, the processor chip in it is a Motorola 6805 IIRC.

I found this out because the one I acquired was completely dead, and one of
the other engineers had swapped chips between this one and another working
one, so knew which chip was faulty. HP (New Zealand) wanted something like
NZ$900 to ship the plotter back to USA for repair, they would not order the
chip for us. At about this stage it was about to be thrown in the rubbish as
it was quite obviously not economic to repair, so I said throw it in my car.
In due course I went investigating the chip in question and noticed that
although it had the fancy HP number on the top, the bottom said 6805, so
grabbing one out of other equipment we had plugged it in with nothing to
loose, and it sprang into life.

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