MacPlus Board Revisions 820-0174 A-D

[frontein1]

I've been able to see that there were at least four revisions of the MacPlus board (820-0174 A-D). What I am unable to find is any definitive information on what (if anything) changed between these revisions.

Anyone able to shed any light on this?

 

[bibilit]

The only thing i can think of are Roms, they are several available, so maybe the revisions are following Roms.

Probably also some changes in the Logic Board design, but should be pretty light.