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From: zech@leadsv.UUCP (Bill Zech)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: AT&T PC 6300 Clock/Calander?
Summary: you need AT&T DOS
Message-ID: <14154@leadsv.UUCP>
Date: 28 Nov 90 21:25:42 GMT
References: <667@nih-csl.nih.gov> <1990Nov28.025350.1018@cbnews.att.com>
Reply-To: zech@leadsv.ese.lmsc.lockheed.com.UUCP (Bill Zech)
Distribution: na
Organization: LMSC-LEADS, Sunnyvale, Ca.
Lines: 35

In article <1990Nov28.025350.1018@cbnews.att.com> wkb@cbnews.att.com (Wm. Keith Brummett) writes:
>
>    In article <667@nih-csl.nih.gov>, gooey@helix.nih.gov (Sean Graham)
>    writes:
>    > 
>    > 	A friend has an AT&T PC6300 with no Clock/Calendar in it.
>    > He'd like to add one but is afraid of incompatibilities between the
>    > AT&T Bus and generic cards.  If anyone knows of a card that will work
>    > with the AT&T I'd appreciate it if you'd let me know the manufacturer.
>
>    Sean,
>
>    To the best of my knowledge, all AT&T PC6300's have a clock/calendar on
>    the motherboard.  Perhaps your friend's machine needs a new battery?
>    (Is the machine an old "standard" PC6300, or a newer 6300 WGS?  I don't
>    think it matters, but I'm not as familiar with the newer WGS series.)
>
>    -- Keith
>

True, all PC6300's (8086 machines) had a built-in clock/calendar chip.
It is powered by a NiCad battery soldered into the system board.  
Eventually the battery loses its ability to hold a charge and the
clock won't keep accurate time.

Also note that unless you are running AT&T MS-DOS, as opposed to
IBM or stock Msoft, the system will not be aware of your clock.
You can write a program to set the clock chip, and to read it
at boot time and set the system clock from it.

I have a program to read the chip and set the system time if 
you need it.

- Bill Zech
CIS: 73547.1034@compuserve.com