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: utzoo!utcsri!utai!utecfa!mugc
From: mugc@utecfa.UUCP (ModemUserGroupChairman)
Newsgroups: net.micro.atari16
Subject: Re: keyboard clock
Message-ID: <1884@utecfa.UUCP>
Date: Sat, 23-Aug-86 12:27:11 EDT
Article-I.D.: utecfa.1884
Posted: Sat Aug 23 12:27:11 1986
Date-Received: Sat, 23-Aug-86 13:51:43 EDT
References: <8608230007.AA28185@ucbvax.Berkeley.EDU>
Organization: Engineering Computing Facility, University of Toronto
Lines: 39

Someone writes:

> The mod just posted is not the best way to get the keyboard chip to keep the
> time.  Youy must keep the reset pin high on the chip when the power is off, or
> the time will just freeze.  To do this, I have used a nand gate circuit.
> Adding another reset button is silly (in my opinion) when it could be done with
> the proper circuit.  Also, the reset line must go low when you hit the rest
> button, or the keyboard will not work correctly.  I will post the mod this
> weekend, so all can see.


I don't want to start a my mod is better war, and I'm only replying to
the above to clear some misconceptions that the above article might
create.  I don't care whose mod is used, and if I had known that someone
was going to post a mod, I would probably not have posted mine.
To reply to some specific points raise above:

	Yes the *RESET line should be kept high, and if you look at the
	circuit I posted, you will find that it *is* kept high. Conversely,
	when you press the reset button the line will go low. Please do
	not post erroneous information.


	The second reset button is the only one you need to use to reset
	the whole system. Yes, it is a bit of a hack, but personally I
	thought it was a reasonable solution given the constraints.


	BTW, the mod I posted is quite sufficient if you are going to be
	using the ST for most of the day, and will leave if off at night.
	If, on the other hand, you want to just use it for a few hours
	a day, you should think of getting larger capacity Ni-Cad cells,
	and making a real charging circuit for higher charging rates.

	Finally, the mod given above works. I have been using it
	for about a week now.


		anees