<> MVII memory use PMI AND CD slots and the CD slots are not bussed for Q.
<
<Yes, but the CD slots *are* bussed together.
True, the B side of the first goes to the A side of the next. It's not a
continious bussing. So if there is a gap the memory chain is broken.
<I still can't find a single signal between the KA630 CPU board and the
<pair of MS630 memory boards that is not bussed straight through between al
<three cards. Other than the bus grant on the A/B Qbus connectors, which
<AFAIK doesn't enter into memory addressing in any way.
The A/B bus is insignificant for PMI memory. also the singnaling scheme is
one of terminated signals with open collecotr drives so a lot isn't
apparent on inspection.
DEC books I ahve don't explain it either. I do have several working
uVAXIIs though.
Allison
Received on Sat Feb 27 1999 - 19:55:19 GMT