(Micro)VaxServer/Station 3100

A good soul decided to give me a pile of 3100's. And I know not very much about Vaxes. So I started digging before I part with most of them. When booting a 3100 it tells you it is a KA41-2,KA41-A,B,D,E, KA42A or B, KA43-A or KA45-B I could not locate a proper list of what is what in 3100's. Lists I found were incomplete or contradictionary. Anyone? What I did find however was that in order to get from a KA41-D to a KA41-E you had to switch Eprom. A MicroVax 3100 turned into a VaxServer this way. A miracle. What consequences has such a switch for your software? Are you no longer allowed to do things? Does some software run and other software not? Although I have a number of VMS books, I could not locate how to make a chinese copy of a disk. It is nice to be able to go back after you tried something hazardous. Help will be appreciated!! Wim