Re: Future time

ralf@uni-koblenz.de
Fri, 10 Jul 1998 21:41:01 +0200


On Fri, Jul 10, 1998 at 10:22:26AM -0400, Richard B. Johnson wrote:

> I have by good authority that the "next generation" of PC Mother-boards
> will not use quartz crystals to generate clocks. They will use ceramic
> resonators such as the kind made by muRata (www.murata.com). These
> devices are surface-mount "chips" to reduce cost, and provide only
> 2 percent accuracy as compared to 0.001 percent accuracy from typical
> crystals presently used.
>
> Since time-keeping is important, and inaccuracies are cumulative, we
> will have to come up with software fixes, possibly using the CMOS timer
> for periodic re-calibration.

These machines are loosing boxes anyway. For example the xntpd software
PLL will most probably loose synchronisation every couple of minutes,
if it syncs at all.

For certain applications such a type of board is plain unuseable.

Ralf

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