Re: A86: batt checker

To: <assembly-86@lists.ticalc.org>
Subject: Re: A86: batt checker
From: "Dux Gregis" <assets@eden.rutgers.edu>
Date: Tue, 1 Dec 1998 13:27:45 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


I decided to look at the routine, so here is what it does:  it counts the
number of times bc is incremented in a loop in the time that it takes for 19
interrupts to occur.  Interestingly, in order for this to work, the clock
controlling the interrupt must be independent of the clock controlling the
rest of the cpu and not as adversly affected by battery power as the rest of
the overall performance is ... maybe an accurate clock is possible after
all.


>
>> i have actually found the routine which displays the "Your batteries
>are
>> low..." message, but unfortunately that doesn't do much good because
>that's
>> only called after the calc knows the batteries are low.
>
>Where is that? If we could find a call or something elsewhere in the
>rom, then that would be what actually checks the battery power... BTW,
>might it be port 4?
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Re: A86: batt checker

From: Cassady Roop <croop@oregontrail.net>