When I first got my ol' 686, it came with Xenix installed, but while experimenting with the CCDOS (courtesy of the late, great Don Maslin, RIP), I managed to accidently wipe the Xenix partition and install the CDOS in it's place. When I had no more space to store it, after a move to a smaller space, I gave my 686 to my friend Mark. I'm hoping to make the trip out there to see him this weekend, (30 miles away) so I'll find out if he has the software somewhere handy.
--T