"Mark P. Gooderum" <mark@nirvana.good.com>  wrote:
 > Ehh, the 68020's have no MMU...the 020 Mac II's had an option for
 > a 68551 (68851?) PMMU.  So Unix would require 020+PMMU or >= 030.

(68851).

And you wouldn't necessarily *require* a PMMU.  HP had their own
MMU for some of the hp300 workstations as did Apollo (back before
HP digested Apollo).  Apollo used something that was pin compatible
to a PMMU (DMMU) but was actually a daughterboard plugged into the
68851 socket and in terms of software was also mostly compatible.

Whatever; "hooked on pedantics".....