I also dotted-lined into Tom in the 90s when the big DG NUMA Unix servers were being developed. I was the product manager for the line--along with a bunch of other systems going back to the mid-80s a few years after the "Eagle" in the book was released.

I've shared this before but a really interesting internal publication from the mid-80s was A Year in Development with lots of interviews and photographs. https://archive.org/details/year-in-dev/mode/2up