Battery backed-up clock on AT

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Article #15800

#15800

From: martin
Date: Sat, 07 Mar 1987 14:23

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Can anyone tell me how to read (or write!) the time from the battery backed-up
clock fitted in the IBM PC/AT? I know that the chip is a Motorola MC146818P,
and believe that i/o locations 0x70 and 0x71 are involved, but havn't got
any further.

This information may be available in the hardware reference manual, but
unfortunately I don't have access to this yet. Any help (By E-mail please)
would be greatly appreciated. Source for programs which access/set the clock
would be wonderful!!

	Martin

usenet: mcvax!ukc!minster!martin
surface:
	Martin C. Atkins
	Department of Computer Science
	University of York
	Heslington
	York Y01 5DD
	ENGLAND

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!mcvax!ukc!reading!onion!minster!martin
From: martin@minster.UUCP
Newsgroups: comp.sys.ibm.pc,comp.os.minix
Subject: Battery backed-up clock on AT
Message-ID: <542125429.6160@minster.UUCP>
Date: Sat, 7-Mar-87 09:23:49 EST
Article-I.D.: minster.542125429.6160
Posted: Sat Mar  7 09:23:49 1987
Date-Received: Tue, 10-Mar-87 06:18:58 EST
Reply-To: martin@minster.UUCP (martin)
Organization: Department of Computer Science, University of York, England
Lines: 20