1 Jul
2016
1 Jul
'16
2:06 a.m.
On Thu, Jun 30, 2016 at 3:59 PM, Joerg Schilling <schily(a)schily.net> wrote:
Dan Cross <crossd(a)gmail.com> wrote:
Sorry, I was referring to using a 68851 with a 68010; I'd imagine that by
the time the 68851 was appearing in new designs, it was paired with the
68020.
Wow. *12* 68451s? That's pretty wild.
Still, the point that the 68451 MMU was pretty
lame is well taken. The
segment table was too small (96 entries?) and it was clearly designed to
support segmented memory rather than paging. It is inadequate to the
latter
task. The 68851 available for the 68020 got it
right; supposedly this
could
be used with the 68010 as well, but I don't
know that anyone ever tried
that in a real product.
We at H.Berthold AG in Berlin did manage to use 12 68451 in parallel for
our
virtual UNOS variant.