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Re:Ask HN: What were the most early Unix type OSes for x86? by thedday on Sunday February 05, 2023 @11:49PM (#34673469)
I think Coherent, of Mark Williams, is a bit older. According to Wikipedia it was first released in 1980, but probably was for the PDP-11, at that point. I used it on an 80286 for years. https://en.wikipedia.org/wiki/Coherent_%28operating_system%2...

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