From: "Chuck Guzis":
If my memory serves, the first ports of Unix for the
80286 weren't
for the PC/AT (i.e. earlier) and were for Xenix, not Unix (yes, I
know, a minor quibble). It was an odd arrangement--Microsoft was
working on the utilities, etc. and Intel was working on the kernel
code. The whole affair seemed to take forever.
I don't recall which was "first", but I worked with the team that
did the XENIX kernel work at Intel. (That work was done on Multibus
systems.)
Vince