BA23 vs. BA123 vs. 42" cabinet?

From: Andreas Freiherr <>
Date: Mon Apr 8 05:20:21 2002

Doc wrote:
> On Sat, 6 Apr 2002, Andreas Freiherr wrote:
> > Looks OK. However, you should be able to omit the DMV11 if you don't
> > actually want to use it: the DEQNA and DELQA are dual-width modules, so
> > each of them will nicely fit into the A/B alots without touching the C/D
> > interconnect.
> I know you can run dual-heght boards in the A/B slots, but what about
> cooling? My MV-II has a couple of black plastic dummies in the C/D side
> that I assumed are for airflow direction. If those aren't strictly
> needed, that would simplify things somewhat.

I have seen a number of MicroVAXen with dual-height modules, but without
those dummies, and I have seen all of them still running after years, so
I don't think you need to get stuck by not having dummies.

Imagination says you'll have only one slot that is half-filled (the one
beneath the memory card, where the DEQNA or DELQA will be), followed by
an A/B/A/B slot with the TQK50 and RQDX3 plugged in. Below these, there
will be a lot of open space. If you are very concerned about cooling,
you might want to partly block air flow in that area to force the air
stream across the electronics, but I still don't think this is
absolutely necessary, provided you stay within the specifications for
ambient temperature etc.

> ...
> Also several hundred CD's, boxes of drives and floppies, boxes of
> tapes, a stack of external tape drives, applicable keyboards & mice,
> yadda yadda yadda yadda.
> It _feels_ very small....

After skimming through the equipment list, I can believe that.

Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
Received on Mon Apr 08 2002 - 05:20:21 BST

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