PDP-11/05-NC with M9301?

I am not sure what you mean by NC grant. On the other hand, when I think more about it, it is a little bit weird with this setup. A MUD slot does not carry the BG signals. And the M9312 does not terminate them unless there is five jumpers installed. This means there will be no terminator for the BG lines. I am not familiar with 11/35-11/40. Is there a terminator in the other end of the bus or is it on one of the CPU boards? The 11/04 (and 11/34) terminate the BG signals locally at the CPU board (since they are not terminated by the M9312 board in the MUD slot), the 11/05 does not terminate the BG signals on the CPU board it self but relies on the M930 close to the processor. So just maybe the BG signals are not propagating very well from the processor back to the device since there are no terminator for them in the far end? Just a thought. I cannot really understand how the RAM card can conflict with the RL02 controller unless they are broken somehow. Fault in the address decoding maybe? I have a QBUS memory board that responds to almost the entire range. /Mattis