Geert Uytterhoeven (Geert.Uytterhoeven@CS.kuleuven.ac.be) wrote:
: Joe Torre wrote:
: > The Sun 3 has a 68020 CPU and 68451 MMU. Any Motorola 020 systems could be 
: 
: Wrong! Sun 3s with a '020 have a custom MMU built of many PALs (I took an
: extensive look at a broken Sun 3/280 motherboard some weeks ago), since
: Motorola wasn't ready with a good working MMU when Sun released the model 3.
: 
: Sun 3s with a '030 use of course the builtin MMU.

Are you sure?

AFAIK, part of the trouble with many third-source device drivers (dialup
ppp, as an example) comes from those "sun3x" machines using both MMUs,
to save SUN the trouble of rewriting all device drivers (their old
devices used to see logical addresses, didn't they?)

Well, I guess this thread does not belong to alt.folklore.computers, as
I thought earlier, but maybe to port-sun3? I guess a quick glance at the
NetBSD-SUN3 sources would tell us what the hardware does?

	Ignatios Souvatzis