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- Newsgroups: comp.sys.ibm.pc.misc
- Path: sparky!uunet!wupost!usc!sdd.hp.com!ux1.cso.uiuc.edu!news.cso.uiuc.edu!schneide
- From: schneide@tortie.me.uiuc.edu (Ken Schneider)
- Subject: How do the DOS clock and the BIOS clock interact?
- Message-ID: <Btz1zE.Ery@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Organization: University of Illinois at Urbana
- Date: Wed, 2 Sep 1992 22:18:49 GMT
- Keywords: pc, clock
- Lines: 22
-
- I recently wrote a short program which allows you to change the
- BIOS clock on a PC. It took me quite some time to figure out
- how to plug things into the interrupt in order to change the
- time, but I learned a lot. One thing I couldn't find anywhere,
- though, was how the BIOS clock and the DOS clock interact. All
- I know is that the DOS clock reads the BIOS clock on bootup.
-
- I'm mainly curious because where I work, we have a lot of
- computers hooked up to provide a reservation system. These
- computers are constantly generating a lot of interrupts and
- my boss refuses to update to a more powerful computer which
- can handle them (we're still running an original IBM AT.
- Because of all the interrupts, the clock is always falling
- behind and screwing up everybody's reservation (if they
- don't show up within 6 minutes, all their time is cancelled).
- Supposedly, if we just use the DOS "time" command, within
- minutes, the time goes back to what it originally was. The
- only way to correct the problem is to update the BIOS clock
- and reboot. What's going on here???
-
- e-mail me at: schneide@aries.scs.uiuc.edu
- If I get enough replies, I will post them.
-