9100A question

[DavidBuehler]

Thanks for the appreciative comments!

I was impressed it just worked after sitting in a box for decades. By comparison, I have an Commodore PET computer of a slightly more recent vintage and many of the keys don't work, presumably due to oxidation of the contacts.

I'm also impressed that the 9100A is designed with so few transistors. And that the CRT appears to be operating in vector mode. Does anyone know if a circuit diagram exists for the circuitry that generates the X-Y input to steer the electron beam?