HP-10 disassembly/reassembly

[[kby]]

Tony,
Thanks for the corrections. It now agrees with at least the part I was looking at and helped me to realize that indeed the K12 pin is connected to the display.

Which leads me to a follow-on question. I'm not sure how the entities are defined in your explanation. The basic question is, if, indeed as is surmised CPU pin 36 is dead and unresponsive to keypresses, should there also be some kind of display artifact as well? Can you give me a better idea of what specific (kind of) artifact I should be looking for? I don't see anything obvious, but maybe I'm just not looking carefully enough at the right time.-kby