Re: REMINDER: Leap Second

[TR Shaw <tshaw () oitc com>]

On Jan 25, 2015, at 6:06 PM, Barney Wolff <barney () databus com> wrote:

> 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.

That made the transformers smaller/cooler and more efficient. I seem to remember a 195 as well but maybe it is just CRS.