Subject: RE: 4000/200 requirements?
To: Carlini, Antonio <Antonio.Carlini@riverstonenet.com>
From: Matt London <matt@knm.yi.org>
List: port-vax
Date: 06/06/2001 15:40:05
Hi,
> >2. The original boardset had a bus load card (a big board full of
> > power dissipation bus loading resistors), a M90xx something.
> > Is that really required with a 4000/200 cpu, or is that only
> > supposed to be used when the boardset lightly loads the power
> > busses? Is it actually functioning as a bus terminator card
> > rather than a true bus load card?
>
> It is just a load card. The BA200 series boxes have two PSUs,
> one for each half of the Qbus slots. These are (IIRC) switched mode
> PSUs and they don't run unless there is a minimum load
> present. Usually the processor plus memory is
> enough to run the RH PSU and a KDA50 is enough
> for the LH PSU.
There are? When I got my 3300 (in a BA215 I think) - it's only got the one
PSU that I could see - on the left. Unless there's something I don't know
about. I know the BA213 has dual PSUs tho - but that's got 12 slots rather
than 6.
-- Matt
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