I talked with my friend the other day and he claimed
that 386 motherboards all used this or that chip sets;
But I vaguely remember I might once have such a 386.
There were, of course, kludgeboards to replace a286 with a 386 or even a
486 without replacing the entire motherboard. I'm running one at the
moment in a PC/AT (true-blue IBM) board. Now that motherboard doesn't
have a 'chipset' as such -- it's all TTL, a couple of PROMs, a couple of
PALs (actually HALs -- the mask-programmed equivalent), and the normal
Intel support chips. So that would make a 386 machine without a 'chipset'
(one reason why I run it, actually).
I've never seen a commercial 386 or higher motherboard without a
'chipset', but would love to find one if they ever existed!
-tony