Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!mips!apple!motcsd!lance
From: lance@motcsd.csd.mot.com (lance.norskog)
Newsgroups: comp.unix.sysv386
Subject: Re: Reliable Clock
Keywords: reliable clock
Message-ID: <4134@motcsd.csd.mot.com>
Date: 4 Jun 91 17:33:29 GMT
References: <1991May30.185306.19755@tsltor.uucp>
Distribution: na
Organization: Motorola CSD, Cupertino CA
Lines: 20

briant@tsltor.uucp (Brian Taylor) writes:

>We run several "pseudo" real time applications on our UNIX systems (ISC 2.2.1)
>but notice that like all DOS systems, the clock on these systems leaves a LOT
>to be desired (to say the very least).

>Could anyone recommend a reliable clock (i.e., one that wouldn't lose more than
>a few seconds yearly or better) that is supported under ISC?  Any ideas of whom
>I can contact is also welcome.

By real-time do you mean minutes, seconds, or milliseconds?

If you need second-level accuracy, you can get a box that listens
to sattelite radio and gives you a serial feed.  Also, there are phone
numbers where people who have these boxes feed them into the phone.

For millisecond accuracy, you can use one of these lab I/O cards
with counter-timers.  You'll have to write your own device driver.

Lance