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From: glen@intelca.UUCP (Glen Shires)
Newsgroups: net.micro
Subject: Re: Re: Voltage protection for micros
Message-ID: <512@intelca.UUCP>
Date: Fri, 15-Feb-85 16:53:45 EST
Article-I.D.: intelca.512
Posted: Fri Feb 15 16:53:45 1985
Date-Received: Mon, 18-Feb-85 19:28:28 EST
References: <480@ima.UUCP>
Organization: Intel, Santa Clara, Ca.
Lines: 18

> A motor-generator with a heavy flywheel should work fine, so long as you
> don't blow all of your fuses while spinning the flywheel up to speed.
> 
> This is the traditional approach to UPS, by the way.  IBM provided such a
> motor-generator standard with each 360/91.
> 
> John Levine, ima!johnl

I seem to remember some big mainframe that used its hard disks as a
"motor-generator with a heavy flywheel".  For a few milliseconds after
a power failure, it could generate power from the motion of the hard disks
and have just enough time to dump core onto one of the disks.

-- 
^ ^    Glen Shires, Intel, Santa Clara, Ca.
O O     Usenet: {ucbvax!amd,pur-ee,hplabs}!intelca!glen
 >      ARPA:   "amd!intelca!glen"@BERKELEY
\-/    --- stay mellow