Digital Group; anyone?

Hello! Name: Jason D. Pero and Canadian citizen, in Kingston, Ontario. BTW, born in Sept. '72 so that marks me as one part of computer revolation. ;) Call me Troll for now. My first intro and been watching this mailing list for a while...Liked it this way. I collect few oldies and prevserve/rebuilding some personal computer equipments. Did several dumpster raids to save few machines. Have touched on two enhanced/souped up Osborne I's in repairs, passed on a Apple IIe /w two drive, Apple monitor to my best friend who LOVE apple stuff with good stuff right off from dumpster to keep him happy and promised to fix his flaky apple II! One Dec "internal" big, removeable hard drive that you open it up to change disk in it's pack and needs two people to move the drive. Huh! I have two Zenith XT types. One is kinda childish small luggeable XT with funny slim 5.25" and flip down keyboard. Did not want to start up often, rarely starts up. Other one 20lb monster laptop model ZWL-183-92 that works without its bad hd. I also have panasonic KX-1080 that still bangs away like new. I have somewhere lost in storage two non-working memory cores boards. My main interest at this moment: This is one of the EARLY bare computer by this company called Digital Group. It dated 1975. Wow! Given to me by original owner years ago '90. I have this boards 32k board, 2k with Z80 cpu, video board/tape cassette combo and I/O board all on the small, semi fake s100 bus. And, it also has keyboard with its oneshots on it. One thing through, the computer is not working! :( What is best way to restore it? Video part uses composite output. What is right kind of monitor to use on this one? I needed documents to set it up right and data source to recreate the ROM chip for this Z80 and some data for downloading to cassette tapes. :) Gak! There you go! Troll