"QBone" is a Linux-to-QBUS bridge, implemented with a BeagleBone Black micro Linux system.
QBone can keep old PDP-11s running, by emulating devices and aiding in repair.
It's UNIBUS sister is UniBone. These pages here do not repeat the general introduction or theory of function, so be sure to dig into UniBone documentation too.
Dynamic discussion at the Google group.