Nova 1210

I was walking past the scrap pile a few weeks back when I saw a large PCB that appeared to be part of a DG Nova system. Digging a little further produced another 3 boards, the cabinet/PSU (alas missing the fan), and the frontpanel bezel. This identified the machine as a DG Nova 1210. Since there are only 4 slots in the backplane, I think I have all the cards. What I have is a Nova CPU board (with _1_ 74181 - did this machine really have a 4 bit ALU?), a core memory board and 2 custom I/O boards (missing a few TTL chips, but the locations are labeled with the 74xx number, so that's no problem). I am missing the lights/switches board. Does anyone know anything about this machine? I assume it's worth saving. A schematic would be useful (or at least a description of the frontpanel board and its interface), since then I could probably recreate the front panel and get it running again. -tony