Re: A83: Strange Ashell bug

To: David Endahl <assembly-83@lists.ticalc.org>
Subject: Re: A83: Strange Ashell bug
From: Linus Akesson <lairfight@softhome.net>
Date: Sun, 21 Jun 1998 22:41:46 +0100
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <l03130304b1b311fe264c@[209.153.178.177]>
Reply-To: assembly-83@lists.ticalc.org


Well, ashell runs basic programs by modifying its own host basic program to
contain a prgmXXXXXXXX. I'm not sure about exactly _how_ the bug develops from
there, but aparently two issues of ashell try to write to / read from /
restore those bytes at the "same" time.

Linus

On 21-Jun-98, David Endahl wrote:

>Hello all,
>I'm curious as to why this happens.  You can try it too, but you
>will have to take the batteries out of your calc.  For 83 users with
>Ashell, try making Ashell compatible with ITSELF :)  Just add the colon at
>the beginning of the BASIC code.  Now, run the program, and try launching
>it from within itself.  As you would expect, it doesn't look like anything
>changes, but now you can't exit, or run any other BASIC programs through
>Ashell.  The assembly programs still work fine, though.  Does anyone know
>why this happens?  I'm just curious, and I confess to having way too much
>free time :)


>-David Endahl
>endahld@scnc.wmston.k12.mi.us

>"Without the band, it's just a GAME!"
>"The first half is pre-game for  the halftime show"
>"The second half is a time to prepare for the post-game show"
>"Come for the band, stay for the football"

References:

A83: Strange Ashell bug

From: David Endahl <endahld@scnc.wmston.k12.mi.us>