Date: Wed, 24 Dec 1997 11:38:52 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Peter Dufault <dufault@hda.com> Cc: hackers@FreeBSD.ORG Subject: Re: procedure to adjust clock drift? Message-ID: <199712241938.LAA02267@rah.star-gate.com> In-Reply-To: Your message of "Wed, 24 Dec 1997 00:56:16 EST." <199712240556.AAA23306@hda.hda.com>
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> > I was told that PCs clocks are usually reliable and they are usually > > off by a fixed clock offset so yes I am thinking about adjusting > > the frequency on the clock in my PC. Typically, I use ASUS motherboards > > which come equip with a Dallas Semiconductor RTC which is supposed > > to be good. Guess, I have to go to the Dallas Semiconductor web site > > to find out more about my RTC part. > > You'll find the specs will show that being off a few seconds > per day is OK. > > > > > > > I wrote some time ago a driver which connects a cheap DCF clock > > > (german radio standard time signal (others should be easy to implement) > > > controlled, price at about 10-20 $) via a simple interface to my > > > (otherwise unused :-) game port (iX 11/1994p6). > > > > Oh, that sounds great most time clocks run about $1000 or so around > > here . I wonder if there is a US counterpart. > > I think you're mixing synchronization cards that provide highly > accurate time sync between multiple systems with one that picks up > a radio broadcast. The sync cards have one master optionally with > a satellite hookup and multiple slaves. > > The clocks that pick up the NIST radio signal in the US are > only about $60.00 or so. I saw one in the last "Damark" catalog. > I even saw a nice looking analog one for about $120.00. > > Apparently the PBS TV stations also broadcast the time in the US > - I got a VCR as a gift and when I plugged it in first time it said > something like "searching for PBS time signal..." and then set the > clock. That should be right up your alley and of course you already > have a TV tuner in your computer. Most Cool! Do you have any pointers on PBS stations broadcasting time signals ? I bet a lot of folks over at the multimedia mailing list would love using their TVs for timekeeping . They are literally suffering over there with "What time is it???" with some programs related to multimedia. Tnks, Amancio
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