It will depend on the board as to just how much info
you're able to
get from the console on a PDP-11.
About the best you can do with a PDP-11, even a fairly "modern" one like a
11/73, is to use console ODT to see if the device CSRs respond. I've never
seen a PDP-11 microcode or boot ROM with anything even close to "SHOW
DEVICE".
Bob