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Hello,

quoted text
> I _think_ some midrange models had an upgradable CPU daughtercard,
> where the older/cheaper daughtercard used an '020 and 68851, and the
> faster boards with 030 used the on-chip MMU. But its been about 18
> years, so dont quote me on it.
>
I don't know any 68020 models upgradable this way ( well, you can 
always swap the mainboard ) but some 68030-based ones, like the 345, 
actually have a 68040 socket on the mainboard and a daughtercard with a 
68030, 68882 and some cache memory sitting in it. These can be upgraded 
by swapping the card for a 68040, adding an oscillator ( a socket is on 
the mainboard ) and upgrading the firmware ROM.

have fun
Michael
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