Re: battery backup for clock

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Article #1190

#1190

From: ModemUserGroupChairman
Date: Sun, 13 Jul 1986 04:08

31 lines
1692 bytes

[+]

Hello All!

In response to the question about setting up a battery backup to the
ikbd (intelligent keyboard) clock:


My experience has shown that when the RESET* line is
pulled low while reseting the ST, this -ve edge
propogates to all the chips listening to the RESET* line
(the ikbd chip being one of them). This causes the
ikbd chip to reset, and in the process of going through
the reset, it sets the time to some magic date in 1985.

Is this true, or is something else changing the time.
I cut the RESET line going to the keyboard, and now
I don't lose the time across resets which seems to indicate
that this is indeed the problem. However, I don't recommend
doing this because it will void your warranty, and if there
is a better solution, your board will be marred for life :-)
Mine is so hacked beyond recognition that one more hack ...

	Anees Munshi

- 
		Anees Munshi
		@ University of Toronto Engineering Comp. Facility :A
		{allegra,ihnp4,linus,decvax}!utzoo!utcsri!utecfa!mugc
                {ihnp4|decvax|utzoo|utcsri}!utecfa!utecfb!munshi

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Message-ID: <1861@utecfa.UUCP>

Path: arc1-ca.pugleaf.net!utzoo!utcsri!utai!utecfa!mugc

References: <1517@alvin.mcnc.UUCP>

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 beta 3/9/83; site utecfa.UUCP
Path: arc1-ca.pugleaf.net!utzoo!utcsri!utai!utecfa!mugc
From: mugc@utecfa.UUCP (ModemUserGroupChairman)
Newsgroups: net.micro.atari16
Subject: Re: battery backup for clock
Message-ID: <1861@utecfa.UUCP>
Date: Sun, 13-Jul-86 00:08:46 EDT
Article-I.D.: utecfa.1861
Posted: Sun Jul 13 00:08:46 1986
Date-Received: Sun, 13-Jul-86 03:35:25 EDT
References: <1517@alvin.mcnc.UUCP>
Organization: Engineering Computing Facility, University of Toronto
Lines: 31
Keywords: 520ST ST clock backup

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