J. Buck Caldwell <buck_c@polygon.com> wrote:
>   I've got these two MicroVAX 3600's - which aren't so Micro
                                         ^^^^^^^^^^^^^^^^^^^^^

I agree!

> - and was wondering if I could take the
> CPU/MEM and put them in the BA123 I've got at home in place of the MVII
> CPU/MEM.

Yes! That's exactly what I plan to do myself. ANY Q22/LMI (local memory) CPU
can be plugged into ANY Q22/CD backplane. That's the whole point of standards.
KA630, KA640, KA650, KA655, and KA660 are all Q22/LMI CPUs. By a Q22/CD
backplane I here mean one that has at least a few Q22/CD slots at the
beginning, so BA123 qualifies as a Q22/CD backplane here. The only caveat is
that since it has only 4 Q22/CD slots, you can have only 3 memory modules,
while KA650/655/660 itself supports 4.

> Also, will the
> BA123 CPU Bulkhead adapter work with a KA650?

Yes.

> The connecters LOOK the same, but...

They are the same.

> Also: Can a KDA50 and RQDX3 co-exist in the same backplane?

Assuming that both controllers are properly designed (not like, say, RQDX1/2),
yes. You only need to set the DIP switches on them correctly, so that they have
different CSR addresses.

> Also: Anybody have a RA90 Fault Code list/Hardware manual?

No, sorry.

Sincerely,
Michael Sokolov
Phone: 440-449-0299
ARPA Internet SMTP mail: sokolov@alpha.ces.cwru.edu