1. You've got two RH11's in the system, but
(as far as I can tell)
you've got no Massbus peripherals. Why not pull the RH11 system units?
Okay. I'd like to trim this down to one cabinet anyway.
2. Why is there no Unibus terminator at the end of the bus? (Or
did you just leave it out?)
Oh, crap. There's the problem?
3. Are the M9300's sitting in RH11 system units?
Just looking
at your list above, I can't see why they'd be in the middle of the
Unibus at all. M9300's are terminators, and unless there's a very
special reason, they generally are only at the end of the bus.
Not sure, I stuck one on the end of the bus - everything started working!
Generally, I think it'd be wise to pull all the unused cruft (esp RH11's!)
and get the entire system in one box.
"Not Interrupting" to me often indicates a problem with interrupt
continuity. And if the interrupts aren't getting through, it's
extremely surprising that any DMA to your RA81's is being done
at all...
Now it didn't.
Apparently, someone moved some terminators around. Looks fine now!
Tim.