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From: grege@gold.GVG.TEK.COM (Greg Ebert)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Real time clock tuning.
Message-ID: <1152@gold.GVG.TEK.COM>
Date: 10 Jul 90 20:47:10 GMT
References: <3440@psivax.UUCP>
Organization: Grass Valley Group, Grass Valley, CA
Lines: 11

In article <3440@psivax.UUCP> torkil@psivax.UUCP (Torkil Hammer) writes:
>My AT compatible has a calendar clock that is about one minute off per day.
>This is annoying.  Can these clocks be tuned?
>

Possibly. If there is a trimmer capacitor next to the 32.768 Khz crystal, try
tweaking it. If there's no capacitor, try replacing the crystal. If you're
lucky, your clock is running fast - try paralleling the crystal with a small
variable capcitor (say 5-50pf) and tweak it. If you aren't a hardware type, 
try writing a program which corrects the time by computing the elapsed time
since last reboot, apply a fix, and update the clock.