unibus backplane list?

[Tim Shoppa]

Oops, to continue my last thought:

The backplanes are attached to the chassis with captive screws.  If you
loosen them up you will find some wiggle-room to realign the slots
with the guides.

If the chassis has ever been physically abused (OK, if you dropped it
you probably put some abuse on the thing underneath too!) it may simply
be bent out of square.

Tim.