Thanks for the quick help, I've been digging in the cabinet some more... The M4801 seems to be a re-labled M7821. The M2860 has "2 Chann. Address Counter" printed on the top... A couple of other interesting pieces, maybe someone has something on them. One is a board with no manufacturer information stamped on it, just the words "Coax Cable Term/Driver" on it. There are 8 BNC connectors on it; pretty obvious *what* it is, but does anyone have any ideas on who might have made it or what some of the specifics might be? The chassis itself has a plate glued to it that reads, "Computerlabs Disk Controller, Model No. G 4112-I." The first four cards are: Status Control 2498B Disk Control Assy No 2847 Assy No 2515B Data Paths Assy No 2474B Bus Control Further back there are 2 pairs of boards, one each of "Driver BD" and "Terminator BD" whose attached cables result in a bundle of 8, 34-pin female connectors. In addition to everything else, there is also a H207 (4096x16 core stack)... Thanks again, Aaron