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Just about everything of worth in operating systems (and in software in general) was already invented in those decades.
Just shows how little we have achieved since then. In both hardware architecture and software based on that hardware.
Wait until they get to the networking layer; you're going to hate what Vint Cerf did in the 70s :)
I understand that you've only been on HN for 7 days, but please don't do this. It's gross.