[177499] in North American Network Operators' Group
Re: REMINDER: Leap Second
daemon@ATHENA.MIT.EDU (Barney Wolff)
Sun Jan 25 18:06:57 2015
X-Original-To: nanog@nanog.org
Date: Sun, 25 Jan 2015 18:06:49 -0500
From: Barney Wolff <barney@databus.com>
To: Stephen Satchell <list@satchell.net>
In-Reply-To: <54C56D34.9050403@satchell.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
On Sun, Jan 25, 2015 at 02:24:52PM -0800, Stephen Satchell wrote:
>
> Today's computers don't use clocks derived from 50- or 60-hertz
> power-line frequency. The last computer I remember seeing with such a
> clock was the IBM System/360. The System/370 used a motor-generator set
> for the power supply, so it had to get its real-time clock time source
> another way.
The 360/95 and /91 also used 400 Hz from a motor/gen. Water cooled, too.
One of my fondest war stories is when the power was turned off for July 4th
weekend but the water was left on.
