I picked up one of the terminal units for the Computer Museum
and just took at look at whats inside. It is a repackaged Burroughs
B25, which is, as you noted, a Convergent 80186 system.
I'd be interested in seeing pics of the insides of the main
server unit.
Convergent OEMed this stuff to lots of people. I think the
Microdata 1000 may be one as well.
I found one of a five disc set today for what appears to be
CTOS rel 9.1-D for the 1000.