Further 11/40 unibus questions...

Hi all -- Still having trouble with my 11/40, though it's getting closer. Currently the issue is: Without a unibus terminator installed, the machine seems to function in that I can use the front panel, toggle in and run short programs, etc. With a unibus terminator installed, the front panel is _almost_ unresponsive -- I cannot examine or deposit memory or load addresses. Toggling "Run" causes a brief flicker of activity (the "Run," "Proc," and "Bus" lights come on, the data lights flicker, and then they turn off, and the "Console" light comes back on.). Ian lent me his M9300 terminator, which caused no changes in behavior. So at least I can (probably) rule out a faulty terminator. I've verified that grant continuity cards (the tiny annoying ones) are installed in slot D of all empty Unibus slots, and that the NPG jumper is installed in all slots (since I currently have no DMA devices installed). Question: Should the NPG jumper _also_ be installed in the one SPC Unibus slot on the processor backplane? (I have a console SLU installed there currently.) This does not currently appear to be present. Before I break out the logic analyzer this evening and start debugging Unibus termination signals, I just wanted to make sure my current configuration seems sane. The boards are installed as follows: Rear: Slot 4 : Empty M9300 Slot 3 : Empty Slot 2 : M7891 Slot 1 : Empty | M981 --- Slot 9 : M7856 | M981 Slots 1-8: <Basic 11/40 CPU set + MMU> Front: (As mentioned before, all "empty" unibus slots have a unibus grant card + NPG jumper installed, Slot 3 has the NPG jumper installed.) Thanks once again, Josh