> .. Two 9M KA630s in a BA123[%] could be a very nice
> machine to play with this sort of stuff on.
> 
> [%] Do I have the BA numbers right?  I can't find any BAnnn marking on
>     mine....

the ba123 is a little r2d2-looking box with four casters and i think
14 slots of qbus on the back, and room for four rd53/rd54/tk50's in front.

the ba23 is a 4U box (once you take it out of the plastic clamshell)
with a 7-slot qbus and room for two rd53/rd54/tk50's in front.

the ba213 is more or less a ba123 turned sideways, so that the wide part
has card edges.  the dssi-style drives go in the top, facing the same way
as the card edges.  better power and cooling than the ba213, and better
i/o connectors (they're bolted to the cards, so no separate bulkheads.)

i'm unable to remember the 8U version of the BA23, it was really two
BA23's welded/bolted together, and was the first configuration they were
willing to sell QDA50's into (because of power draw and bulkhead cable
size.)  jamming QDA50's into ba23's was left as an exercise for the sysadmin.