[Info-vax] Old junk breaks

[Steven Schweda]

> I got one (individual unit supply), an H7867 dual voltage 5/12v [...]

   Just don't try to use it with a 5V-only Work Group Unit!

   I've packaged most of what I've learned on this topic here:

      http://antinode.info/dec/DECxxx90_Power.html

   In my travels, I found fancier connector pictures (and other info)
here:

      https://forum.vcfed.org/index.php?threads/x.62810/

   I also noticed that the H7876-AA supply on my DEHUB-AX offers
5V @ 15A, +12V @ 1A, and -12V @ 0.1A.  I haven't looked to see if the
DEHUB distributes the -12V.  I haven't seen a Work Group Unit which
wants it, or a single-unit supply which offers it, but that proves
little.

   One other note: As I recall, I've had a couple of cheap-Chinese
5V @ 2A adapters fail after a few years (driving DECserver 90M or 90TL).
Replacing the bad capacitors got tedious, so I've started buying
(cheap-Chinese) 4A models, which I hope will last longer.


> By golly, you're right. [...]

   It happens from time to time.