Paul wrote:
Apart from the obvious "if it's hex it must
be Unibus" there isn't a
surefire way to tell things apart.
DEC made *many* hex modules that are not Unibus. There are hex Omnibus
modules for the 8/a, and plenty of hex non-Unibus modules in the KL10
(PDP-10) and some early VAXen. There were also "extended hex" modules
used in the KS10 and other early VAXen.
Eric