Re: A89: Check sum problem Really need help

To: assembly-89@lists.ticalc.org
Subject: Re: A89: Check sum problem Really need help
From: Nathan Mueller <nlmueller@students.wisc.edu>
Date: Thu, 3 Dec 1998 10:38:22 -0600
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <03ff01be1e8d$dd8d4e80$72e0e6a5@Sammy.rutgers.edu>
Reply-To: assembly-89@lists.ticalc.org


>There's a similar thread to this on the assembly-86 list.  The 86 ROM tests
>to see if the time in which the mask runs out on the keypad port is shorter
>than a predetermined number of CPU clock cycles (if it is, you're low on
>batteries), and this is probably similar to what the 89 does.  You can make
>this into a percentage, but the problem is that you have to read from the
>port and increment a counter within a loop, and the longer that it takes you
>to do so, the less accuracy.  You might be able to use the interrupt as
>well, if the interrupt clock is independent of the 68k processor as it is on
>the z80.

This is why I think it would be usefull to make our own ROM versions.
Stuff like this can be done without silly hacks.

	--Nate

References:

Re: A89: Check sum problem Really need help

From: "Dux Gregis" <assets@eden.rutgers.edu>

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