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From: kbe@dde.uucp (Kjeld Borch Egevang)
Newsgroups: comp.sys.ibm.pc
Subject: Re: How to set clock time?
Message-ID: <199@mother.dde.uucp>
Date: 4 Aug 89 09:47:45 GMT
References: <89210.221625HJW2@PSUVM>
Organization: Dansk Data Elektronik A/S, Herlev, Denmark
Lines: 20

HJW2@PSUVM.BITNET writes:

>My AT clone (DTK motherboard, DTK BIOS) has a built-in, battery operated clock
>which is 5 minutes slower per day.  I have tried to use setup program to reset
>the clock time but all I could do is to set the current time not the clock
>speed.  So, every once in a while, I just set the time to keep it accurate.  I
>am wondering if there is a way to set the clock speed just like that in an
>ordinary watch?   It does not affect the system performance though.

Write a program setting the hardware-clock and call it from AUTOEXEC.BAT. The
necessary interrupt is described in the recently posted list in
comp.binaries.ibm.pc. You'll need some day-to-seconds routines in order to
find the number of seconds since last setting and the add the percentage
necessary (hey, perhaps I ought to write such a program myself!).

The original IBM AT uses a Motorola hardware clock (I'm very unsure, but I
think it's called 6318) with a fixed clock :->, so tuning is not possible.

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