28 Apr
2001
28 Apr
'01
2:24 a.m.
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
Not even close IIRC. The 68451 is an MMU. I've
only seen it as the 64 pin
DIP version, again in the XXX (which has 3 64 pin chips on the CPU board
(aka 'Stickleback'!) -- the 68000, 68450 and 68451.
Must have been some sort of Motorola reference design. The Software
Results "Node Box" I mentioned has a DIP 68451, too. We never got
the software that far advanced, so I have a DIP socket, wired to
bypass the MMU. Just drop it in, and the system works without
memory management.
It is listed as obsolete by Motorola because it is _not_ compatible
with the later, and more common, 68851 that was used with the 68020.
-ethan
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