Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 alpha 4/15/85; site cbosgd.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!cbosgd!mark
From: mark@cbosgd.UUCP (Mark Horton)
Newsgroups: net.periphs,net.news.sa
Subject: uninteruptable power supply for a VAX
Message-ID: <1218@cbosgd.UUCP>
Date: Mon, 3-Jun-85 16:59:12 EDT
Article-I.D.: cbosgd.1218
Posted: Mon Jun  3 16:59:12 1985
Date-Received: Wed, 5-Jun-85 00:25:25 EDT
Organization: AT&T Bell Laboratories, Columbus, Oh
Lines: 19
Keywords: ups, vax, power failure
Xref: watmath net.periphs:775 net.news.sa:115

Is anyone out there running a VAX 750 (or 780) on some kind of
uninterruptable power supply?  I see lots of ads for UPS's that
have regular 120V plugs and seem like they could keep the machine
up in a thunderstorm.  But I look at our 750 and it has lots of
kinds of funny plugs, some of which are apparently custom built
by local electricians.  Disks like RM80's have regular 3 prong
plugs.  The CPU has a funny round plug which is described to me
as "single phase, 20 amp, 120V", which sounds like an ordinary
circuit with lots of capacity - I don't understand why the funny
plug at all.  The tape drive (TE16) and one of the disks (RM05)
have their own special plugs, too.

Has anyone figured a reasonable way to keep such a machine running
through a typical one second power hit from a thunderstorm?  What
do you do?  Has anyone concluded it can't be done or is a bad idea?
Are these things any good for a smaller machine with a regular plug,
like a Microvax, Sun, or 3B2?

	Mark