For the benefit of someone digging through comments in a future generation. I chatted w/ Lars via email. My memory of "doing LOGO" on a 940 comes from typing on a terminal that was sitting next to a 940. It's entirely possible the terminal was connected to another machine, and it just happened to be next to the 940. Lars suggested LOGO was actually running on a PDP-11, which is certainly within the realm of possibility. Alas, I am depending on memories from over 50 years ago, so I can't be completely sure.