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From: dold@mitisft.Convergent.COM (Clarence Dold)
Newsgroups: comp.sys.ibm.pc
Subject: Re: set system clock?
Message-ID: <1233@mitisft.Convergent.COM>
Date: 21 Sep 89 15:05:16 GMT
References: <19500034@uxh.cso.uiuc.edu>
Organization: Convergent Technologies, San Jose, CA
Lines: 21

in article <19500034@uxh.cso.uiuc.edu>, beaucham@uxh.cso.uiuc.edu says:

> The TIME command allows me to reset it for DOS (3.0) so as long as I leave
> the machine on I'm o.k., but when I turn it off, it comes back up with the
> same crummy incorrect time.  What's the trick to setting the actual hardware
> system clock?  The DOS manual says consult your GTO.  What's a GTO?

Starting with DOS 3.3, INT21 AH=0x2E sets the time, and also adjusts the 
CMOS clock.  I would assume that TIME uses these INTs.
Aside from that, I have written a short program called udate 
that accepts a UNIX style command line to set the time and date,
using both the RTC calls and INT21, so it should work on earlier DOS.
I could mail it or post it (?).

A '68 GTO was a great machine, that had slightly more power than the 
original IBM PC.     I think it was built by Pontiac.  :-)  :-)
-- 
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Clarence A Dold - dold@tsmiti.Convergent.COM		(408) 434-5293
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