If these kinds of machines interest you I highly recommend the book "The Supermen" by Charles Murray. It has all the details you would ever want on Seymour Cray and others in the business.
I was working at a geophysical company in the 80's and we lusted after a Cray-1. Best we could afford where array processors (CSPI) connected to VAX systems.
If you enjoy Tracy Kidder's writing (and I very much do) I would also suggest just about anything by Michael Lewis - his "Liars Poker", "Moneyball", and "The Big Short", to name a few, are really exceptionally well researched and written.
Just saying.