>> ... BA123[%] ...
>> [%] Do I have the BA numbers right?

> 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.)

Hm, now I'm not sure *what* I've got.

My VAX-on-wheels cabinets have four drive bays, but inserting a drive
into one involves moving it front-to-back.  Inserting a Qbus card means
moving it right-to-left, as viewed from the front of the machine.  And
I/O connectors are bolted to little "knockout" (actually, "unscrew and
remove blank plate") spaces such that they face the back of the
machine.  There are four spaces of about 2¼ by 3¼ inches (suitable for
a KA630 connector-and-switch panel, or four serial ports on eg a
DHV11), one space about 5 by 3¼ inches with a brace that when installed
divides it into two more 2¼x3¼ spaces, and four narrow slots suitable
for DEQNA AUI-and-fuse panels.

Four Q/CD slots and eight Q/Q slots.  There's a 13th slot that is not
part of the Qbus (I think it has just power) and is not inside the
inner metal cage that surrounds the Qbus; it is apparently designed for
a signal breakout board for RD/RX controllers.

This sounds like a BA123 in terms of drive and I/O connector mounting
but a BA213 in terms of Qbus card positioning.

I'm Confused. :-/

I have two of them.  The one I can easily check on has a sticker
showing "Model: DH-630Q4-E2".

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