Guys, I'm about to finish another project: "UniBone" - a Linux-to-UNIBUS bridge, based on the BeagleBone Black.
It is supposed to be a development platform for device emulation.At the moment it can emulate memory, emulate an RL11 controller with 4 RL drives attached, and act as UNIBUS hardware test adapter.
There are some web pages at http://retrocmp.com/projects/uniboneAnd I'll show it on VCFE.CH in Zurich on Nov 24/25, plugged into a PDP-11/05.
Enjoy, Joerg