Continuing PDP11 saga

I tried taking an M8027 and setting its address to 170400, to make it look like the ADV11-C. However, when typing that address before and after I installed the board, at the @ prompt, it returned 177777. Also, the DRV11, at 167770, does the same thing. The DRV11-B gives 000000 (at 772410), although at the CSR (772414) it gives 006800. My printer card that I tried to use as a fake ADV11 has jumpers on pin 12 and pin 8, with the rest removed. Is this correct for setting it to 170400? I noticed on the DRV11 card that it says jumper in = logic 0. That one has one jumper on pin 12, which I assume gives it the proper address of 167770. This one appears unmodified from the factory. Are my jumpers on the printer card the opposite of what they should be? Is 177777 what is returned for a missing board? If I have the jumpers reversed on the printer card, that would explain that situation, but it doesn't explain the DRV11, unless its bad. Any thoughts? Thanks, Tom