Subject: Re: VAX7000 3-phase
To: None <port-vax@NetBSD.ORG>
From: John Wilson <>
List: port-vax
Date: 03/04/2002 22:19:06
>From: Johnny Billquist <>

>Well, I believe that just about all VAXen except 8600 (and perhaps other
>really largish VAXen) will work just fine on single phase.
>I can't really imagine anything needing 3-phase except motors, in these
>things. And the 6000-machines don't use those kind of motors anyway. I
>would suspect the 7000 are about the same thing.

Not to fan the flames but:  in the DEC-2065 power supply, there really
honestly IS a three-phase transformer followed by a six-diode bridge
rectifier, for at least one of the weird ECL voltages (I forget the details
but I dug through the schematics when I was hoping to get one of these
monsters running in my garage).  I guess they really cared about ripple...
So that's one thing besides motors that could have a real use for three-phase,
but hopefully the later PSes were switchers and whatever ripple they had,
would have nothing to do with what's coming in the line, so there'd be no
benefit in making them require weird power.

John Wilson
D Bit