<I seem to remember it being in a Terminals/Comms handbook (which I can't <find at the moment :-(), where it claimed that the PDT11 was _not_ a <PDP11, since it didn't have a Unibus/Qbus on it. Didn't say it wasn't there. Only that at that time for marketing reasons it was "improper" to call it a PDP-11. <The PDP11 Architecture Handbook is inconsistent. It describes the 'Two <PDP11 Expansion Buses' but also calls the PRO300-series 'A PDP11 family <member'. As I said. a few years later... Allison