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Re:Ask HN: What were the most early Unix type OSes for x86? by ggm on Sunday February 05, 2023 @11:38PM (#34673409)
MKS. Might not fit your ontology of "unix" but it pre-dates this, 1985 maybe?

KA9Q was focussed on the IP stack but to implement the IP stack an awful lot of what looks like libc was probably implemented.

The history of C-like ports to 286 architecture probably informs what you're after.

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