-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello,

> 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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (Darwin)

iQEVAwUBQh/ePcpnzkX8Yg2nAQL6UwgAj1oTy2mfwao9lOjEILkguDkCSADRuKHB
4ovufyAFlohXXO50Fzp9R3uR29X2VcQFxb3OEwxXU12AOe33DlLPzi9QGBVybbDi
oNnCTEbIx+7R2TR45q3A/8s6zHZtfNsM8j/wvUGUP23gesA7QbzjZhbL+ney/2K0
NdecfdOGQd4j/sjlvK2REMOutFsX7QWhkoKs7ysFcbG1qBNWSln2LRqjycmckb8q
HhzvWaqrn2dSc/M9g2M4Rih89Kj0aJ1N0vJnsTSuvbz/MiWUklXoHesi8GbmW8kF
KDdtmXgdCdyvElbAdRxjV0es0X2Gu+a8OM6h0OR697OT4qR8Cpq1sg==
=V/1P
-----END PGP SIGNATURE-----