[time-nuts] PC clock generator without 14.318MHz

Poul-Henning Kamp phk at phk.freebsd.dk
Tue Oct 18 16:38:54 EDT 2016

In message <ep0d0ctbrovmisvj43j57ns6smt606t3fs at 4ax.com>, Gary Woods writes:
>On Tue, 18 Oct 2016 16:53:15 +0200, you wrote:
>>14.317 MHz quartz.  Such frequency is a relic of original PC design
>It's 4X the color subcarrier frequency in NTSC (originally U.S.)
>television; rapidly becoming a dinosaur. I'm sure it was used in computers
>to make color video easier. Newer boards doubtless use much faster clocks
>and synthesize what the parts need.

It's 14.3181818 MHz and it has a most facinating history - if you care
for that sort of thing:


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

More information about the time-nuts mailing list