The rise and fall of IBM's 4 Pi aerospace computers: an illustrated history

Author here: I've finally finished a detailed history of IBM's 4 Pi computers, powering everything from the B-1 bomber to the Space Shuttle. Let me know if you have questions...

Back when I was in the USAF they told us 4 Pi was because it was essentially two IBM 360 mainframes in parallel. Probably BS but that was what we all thought.

Really happy to see this history lesson in any case, I had mostly forgotten about my experiences from the mid 90s.