Re: A86: Re: Battery Test

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Re: Battery Test
From: Butler Family <butler2@erols.com>
Date: Fri, 15 May 1998 16:14:31 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <01bd802f$37d70aa0$1e2db7cc@p2y5m5gv>
Reply-To: assembly-86@lists.ticalc.org

It doesn't check the contrast level because when you turn it on w/ the
contrast level up it doesnt give you a battery level message.  And it doesn't
disappear after changing the contrast when you force it to come up using
enter.

It might be that it doesn't return a battery level at all but has a flag or
something somwhere that is set when voltage drops below a certain level.  It
would be pretty easy electronically since applying more voltage to a certain
part of a transistor turns it off.  My knowledge of electronics isn't very
good but it sounds likely since it would only take a transistor to use but how
they get the other voltage to check it against I don't know the backup battery
maybe or a special circuit.  Of course what I probably just said is possibly
(likely) entirely wrong.

Patrick

ps. Please don't tell someone they are obviously wrong especially when they
are right or at least more so then you.  It is very rude.

Kevin Buck wrote:

> isn't it pretty obvious how it checks the battery level?  It merely checks
> the contrast level...

References:

Re: A86: Re: Battery Test

From: "Kevin Buck" <mckbuck@coastalnet.com>