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by ThrowawayB7 1228 days ago
Microsoft Xenix (later SCO Xenix) is probably among the first, if not the first, x86 UNIX: https://en.wikipedia.org/wiki/Xenix

"The first 8086 port was for the Altos Computer Systems' non-PC-compatible 8600-series computers (first customer ship date Q1 1982). ... SCO Xenix for the PC XT shipped sometime in 1984 ..."