Hello and asking for help with HP 67 power unit

[Tapti]

Andi,
thank you for your kind words. The problem is, I'm a physicist by profession and these physicists think, they have to understand everything. That's their profession and their problem ...
Let's see what I can still get out of this antique piece of electronics. Perhaps I'll give it to the electronics workshop in our institute, if nothing else helps. Nevertheless I'm really thinking about purchasing one of these teenix boards. They have obviously a very good reputation and it will certainly be nice to play around with.
Greetings
Stefan