...for those of you who remember the discussion about my dead 9810 in late december last year, I am glad to report that the machine now works again, at least partially. There is still some work to do on the printer and tape drive units, as well as on the power supply, but the calculator itself works flawlessly. I wrote a report on the repair hoping that it might be helpful to revive other 9810s:
It's a fascinating machine, and I learned a lot about its architecture. Long live the 9810!
Andreas