[time-nuts] 60Hz mains clocking in computers

[paul swed]

Talk about dusting of the old brain cells.
I seem to remember that the PDP 11/23s did indeed allow the use of the 60 hz
as an interrupt for precision timing if that can actually be said. The data
general nova 1200 also. Boy thats exposing ones age.

On Sat, Dec 12, 2009 at 8:29 PM, Colby Gutierrez-Kraybill <
colby at astro.berkeley.edu> wrote:

>
> I'm trying to get to the bottom of whether or not any computing equipment
> made around the advent of UNIX systems (or any time-slicing system) used the
> mains cycles of 60Hz as phase lock for the internal system clock.  My guess
> is that perhaps they did not as the computing logic is DC based, but, I have
> memories of using an 68000 based UNIX system that I thought had its internal
> clock based off of the 60Hz mains...  Not sure the vendor anymore.
>
> Thanks,  Colby
>
>
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