He did wrote a lot of articles about fixing old HP equipment.
But you have to be a member of the HPCC to read them.
So don't hesitate and become a member..
Actually, the series on the HP98x0 calculators and that on the HP9866A printer
are available (reformatted, and in one 'manual') from the Australian HP museum
site. Anyone can read them.
Not that I want to put people off joining HPCC of course :-)
-tony