The Decserver 550 CPU board that I bought via eBay arrived today. Looks to be in fine physical condition, no idea if it works of course. As expected, it has 1.5 megabytes of RAM and an 18Mhz crystal. That's enough to run 2.11, which is my goal.
Also supposedly on the way is the BA-11 expansion box I bought via eBay, and a network card Phil offered me. Will have to rummage the flea at Dayton to see if we can find a suitable disk controller. What I really want is a card that will do MSCP to SCSI disks...