Kim Hawtin wrote:

> C & D are for CPU and memory info only?

No. But you do need CPU+memory for a viable
system so that does mean the first two quad-width slots
will be gone. You might be able to use some quad
cards in that third slot.

> an article i found mentioned serpentine Q22/Q22 bus. On the ba23, the
> first three slots are Q22/CD, then after that Q22/Q22.
>
>   BA23:
>         Q <- Q    Q <- Q <- Q <- Q
>         |    ^    |
>         V    |    V
>     <-  Q    Q <- Q   CD <-CD <-CD
>
>   BA123:
>         Q <- Q    Q <- Q <- Q <- Q <- Q
>         |    ^    |
>         V    |    V
>     <-  Q    Q <- Q   CD <-CD <-CD <-CD
>
> copied from here;
>   http://h71000.www7.hp.com/wizard/wiz_1149.html

Looks correct. I'd certainly not argue with that
particular wizard :-)

What you need to know is exactly what cards you have
in which slots. From the list of cards you can generate
a list of CSR/vector settings that the cards should
be set to (this does not depend on the order of the cards).
Then you check that the cards are actually set that way.

Antonio