VAXserver 3100

I have come into posession of some old DEC equipment... A VAXserver 3100 Storage Expansion Unit (?) and a VaxStation 4100 (?) (?) These look pretty stripped, dunno much bout VAX hardware so I can't really say how bad. The VaxServer 3100 looks to be mostly complete and gives me some beeps if I turn it on.. I wanna try and get the 3100 to a running state (or at least determine if its worth it) ... Anyone have any pointers to information about this specific model? (it seems that the VAXServer 3100 has a number of submodels /w different connections on the rear?) Or, more specifically, how to determine what model it is *specifically* (other than the nameplate on the front).. The backside says the model # is DJ-31CP1-A, however a google search doesn't turn up much. The type of and location for serial consoles would prolly be the biggest help, so I can actually get some output from this thing. Thanks in advance, -jwb