No, those units were the Fuzzballs. (I think the
hardware name
inspired the softtware.)
Amonst my junk is a PDP-11/23 with an MS connector on the back prominently
labeled "IMP". Inside is a special 2 board cardset that acts as the
network interface - a 2901 based thing, probably more powerful than the
PDP-11.
I would like to find out more information on this cardset - it is not
from DEC and is probably a low run custom job by some
long gone shop.
Sorry, that is just about all I know about it.
One of the more interesting things about the PDP-11/23 is that it was
never used. The little bags of parts and things are still wrapped onto the
chassis, as they were the day they left the factory.
William Donzelli
aw288(a)osfn.org