From: Pete Turnbull
2.9BSD doesn't need split I&D, but 2.11BSD
does.
Doesn't 2.11 also need Supervisor mode (at least, for the networking code)?
Of course, there is not (AFAICR) any machine with split I&D but not
Supervisor, so the question above is purely intellectual, not of practical
consequence. (Unless you have an 11/xx with an Able ENABLE board! :-)
Noel