On 5 Sep 2007 at 10:46, Chris M wrote:
   Do you mean like development systems? I'm not
aware
 of any pre-AT '286's - not saying there weren't any.
 They seem to have less exposure then pre-5150 Intel
 stuph. 
Definitely were.  I worked on the port for the Durango Poppy, for
example, using early steppings of the 80286.  Interesting thing is
that pre-production silicon was available on the 286 and the 186 at
about the same time.
I wonder if there were any 80286 coprocessor plug-in boards for the
XT before the AT?
Did Compupro and/or Altos have a pre-PC-AT 80286 system out?  I think
so.
Cheers,
Chuck