[Info-vax] DS10L releases magic noise

[John Wallace]

On Apr 27, 1:11 am, George Cornelius <cornel... at eisner.decus.org>
wrote:
> Bob Koehler wrote:
> > In article <ad578a4a-2b36-4558-9dfb-93f7056d8... at h5g2000vbx.googlegroups.com>, John Wallace <johnwalla... at yahoo.co.uk> writes:
> >> Does "out of the chassis" also mean disconnected from its low voltage
> >> wiring? Apologies if the following is already known to you...
> >    Yes it does, and I haven't had time to work on it, but it will be
> >    a PITA to measure those lines in place.
>
> Measure a SCSI connector.  Two of the voltages are present.
>
> You _could_ pierce insulation with a straight pin if you were
> careful and did not mind a minimal disruption of the wiring.
> Just don't let the bare metal short to anything.
>
> George Cornelius

Do the IDE drive power connectors not also have the required voltages
(or are we even talking about the same thing, given that classical
SCSI drives used the same Molex power connector as IDE drives)? Thes
Molex SCSI/IDE power connectors surely have +12V and +5V, right? These
might be reasonably easily accessible, but whether these are (or
should be) the same +12 and +5 voltages as may feed the motherboard is
a different question. An ohmmeter (or a circuit diagram) may help
clarify. Not sure a SCSI card is necessary for this set of
circumstances.