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>=20
> Well, it is an easy observable fact that before the PDP-11/70, all =
PDP-11 models had their memory on the Unibus. So it was not only "an =
ability at the lower end", b

That=E2=80=99s not quite true.   While the 18 bit addressed machines all =
had their memory directly accessible from the Unibus, the 45/50/55 had a =
separate bus for the (then new) semiconductor (bipolar or MOS) memory.