Unix Architecture Evolution from the 1970 PDP-7 to the 2018 FreeBSD
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Unrelated: We had many different PDP's and the old PDP-8 still brings back fond memories. It was the first real computer under $10k and I dreamed that some day I'd be rich enough to own my very own computer, even though I didn't know what I would use it for.
There are a lot of Unix history articles out there, but this appears to be a genuinely new contribution. Kudos!