Apple Mac LC II and LC III

Fresh from a local garage sale, picked up an Apple LC II plus monitor and some documentation for twenty bucks and am wondering about a few things: Firstly does anyone have the wiring details for the SCSI conector at the back or know where I might get it?? Secondly does anyone know what plugs into the white 96 way connector near the back left of the mother board labeled J20?? I have an Apple LC III with something plugged into this conector and would love to know what it does. I have a LC III that I picked up ages ago, and would love to have them "talking", can anyone give me some details on the "apple talk" conector. Can some Apple fan direct me to a nice juicy apple Tech site, I have never used these systems but they seem to be working, i'd love to get them going with a few other extras, but will need some more detailed info. Thanks in advance, Peter T.