Vax 6320 on Ebay

[Antonio Carlini]

>How can test the five power supply units? 

I don't think there are any load boards for either the
XMI or the BI bus - I presume that's because there is
no need for them.

The PSU regulating modules are clearly visible at the
back. They can source a considerable current (300A
springs to mind) so if you really do want to stick
voltmeter probes there you'll want to make sure you
have no rings or other metalwork anywhere and you
must replace the protective plastic covers when you 
are done. That large a current will do very nasty
things even though it is only low voltage.

>Three-phase power is already available, so is it okay 
>to pull the cards and start the box or are additional 
>resistors (car lamps, ...) needed?

I'm reasonably sure I've powered up an empty VAX 6000
box before now with no ill effects. (Empty apart from
the console tape etc.). I also recall that there are 
other power connectors around for various add-ons
(you could add RA7x disks to later cabs) so you
might be able to provide a load that way if you
find it does need one.

If you hunt around on the web you can find various
people who have done a 1-phase conversion on the
box - they probably have experience of what you
need to do to test the PSU.

There's lots of documentation on http://vt100.net/manx.
Look for any VAX 6000 docs and any KA62-KA66 docs.
Anything with XMI in the title should be useful too.

I used to support the drivers for the DSB32 and
DMB32 so once you get around to trying those out
I may be able to provide some hints.

Antonio
arcarlini at iee.org



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