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Article #21507

Re: IBM-AT Clock rate control. Is there one?

#21507
From: Henry Spencer
Date: Sat, 27 May 1989 22:06
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In article <2536@Portia.Stanford.EDU> jimb@Portia.Stanford.EDU (Jim Bjorksten) writes:
>It's driving me crazy.  I set my IBM-AT internal clock every time on
>power it up.  Nevertheless it slips a few minutes/day.  Is there a way
>to adjust this.  I thought the darn thing was crystal controlled.

It almost certainly is.  But there are crystals and there are crystals.
Like most components, crystals come in different accuracies, and better
ones cost more.  Things like temperature changes and component aging will
also affect accuracy; a good design will try to be relatively insensitive
to them, but not all designs are good.  In the PC market, cheap usually
wins over good.

There may be an adjustment capacitor near the crystal; there may not be.
You might also try replacing the backup battery -- perhaps it is not
giving quite the voltage it should.
-- 
Van Allen, adj: pertaining to  |     Henry Spencer at U of Toronto Zoology
deadly hazards to spaceflight. | uunet!attcan!utzoo!henry henry@zoo.toronto.edu
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Message-ID: <1989May27.220618.3762@utzoo.uucp>
Path: arc1-ca.pugleaf.net!utzoo!henry
References: <2536@Portia.Stanford.EDU>

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: IBM-AT Clock rate control. Is there one?
Message-ID: <1989May27.220618.3762@utzoo.uucp>
Organization: U of Toronto Zoology
References: <2536@Portia.Stanford.EDU>
Date: Sat, 27 May 89 22:06:18 GMT