I think I forgot to mention the date previously,
component dates codes are
into 1979, somewhat late for core. LSI mem would have produced a smaller
module by then. Either it was some special-requirement system or probably a
legacy design/production issue.
My guess is that it is part of a military system. Burroughs was a
large defense contractor (Unisys still is - and the only thing keeping
them afloat). The military was still procuring core memory as late as
1989.
--
Will