[time-nuts] World's most accurate PC clock!

W. D. WD at US-Webmasters.com
Sun Jul 3 00:38:39 EDT 2005

At 15:11 7/2/2005, Poul-Henning Kamp, wrote:
>In message <a05210600beec95afd329@[]>, David Forbes writes:
>>It could easily be multiplied by 4 to make the canonical 14.318 MHz 
>>PC clock, so your DOS machine could be made to work at high stability 
>>and reasonable accuracy.
>I've done that for years.
>Most PC's will run from approx 13.8 to 15 MHz.
>Usually I use a PLL chip (ICS525).
>Works great.
>And btw, the 14.318MHz frequency is 4 x the color carrier in NTSC
>because that's what IBM used to make the ghastly colors on the
>orginal CGA adapter.

Is there a 'HowTo' for this somewhere?  How many pins are 
connected and to where?  Where do you mount the chip?  Any
batteries involved?

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