Going back in time to the late 70s....
On a config with three RK05s Unix v7m more or less fits without too many fancy features. Two of the three RK05s are emulated on a VRC 8256 box and loaded from ZIP.
The PDP11/55 is flagship of my fleet but will soon leave for a new life in another collection. It will have to compete with a VAX 11/785 for the role of flagship.
See what happens after BOOT/FOR RK0: from RT11 running on the left RX01 8" floppy. Thanks to Roland for filming this event.