On Sat, 16 Dec 1995, Allen Briggs wrote:

> The 68020 in a Mac II needs the 68851 to run NetBSD.  The 68030 and 040
> have built-in MMUs of their own.  The 68030 MMU is quite similar to the
> '851.  The 040's is different.

The first half, I gathered from this old book on the 020 and 030.  The 
040's is different, huh.  What a drag.  How drastic are the differences?  
Does NetBSD use the PMMU/030 MMU to signal page faults, etc. for the 
swap/virtual memory, or is it all handled with a table lookup scheme?

Later,

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