[TUHS] 68000 vs. 8086 ( was Algol68 vs. C at Bell Labs)
crossd at gmail.com
Fri Jul 1 06:06:33 AEST 2016
On Thu, Jun 30, 2016 at 3:59 PM, Joerg Schilling <schily at schily.net> wrote:
> Dan Cross <crossd at gmail.com> wrote:
> > 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
> > task. The 68851 available for the 68020 got it right; supposedly this
> > 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
> virtual UNOS variant.
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
Wow. *12* 68451s? That's pretty wild.
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