Re: A92: Need Help to replace interrupt vectors

To: assembly-92@lists.ticalc.org
Subject: Re: A92: Need Help to replace interrupt vectors
From: Niklas Brunlid <e96nbr@efd.lth.se>
Date: Tue, 10 Feb 1998 20:59:42 +0100
In-Reply-To: <v03110701b1064658532a@[134.157.81.172]>
References: <34E09462.B37B053C@hell1og.be.schule.de> <v0211010ab0fb10103e0e@[206.149.127.65]>
Reply-To: assembly-92@lists.ticalc.org


At 19:09 1998-02-10 +0100, you wrote:
>
>I tried to use the way to redirect an interrupt vector used by David
>Ellsworth in gray4lib and suggested by him in "convert.txt" (see below),
>but when my program terminates, it always freeze the calc.
>By the way, the only thing my new interrupt vector do is branch to the old
>interrupt vector.
>
>	move.w	#$0700,d0
>	trap	#1
>	move.l	$64,old_int_1
>	bclr.b	#2,$600001
>	move.l	#int_1,$64
>	bset.b	#2,$600001
>	trap	#1

It freezes because your program is moved by the TIOS, but the interrupt
still points to its old adress. You have to restore the interrupt before
quitting the program.
If you succeed in making a TSR, let me know.


Niklas Brunlid - http://www.efd.lth.se/~e96nbr
PQF Quote follows:

Probably the last man who knew how it worked had been tortured to
death years before. Or as soon as it was installed. Killing the
creator was a traditional method of patent protection.
        -- (Terry Pratchett, Small Gods)

Follow-Ups:

Re: A92: Need Help to replace interrupt vectors

From: Arno.Kizina@t-online.de (Arno Kizina)

References:

Re: A92: BBS software

From: "David Kühling" <dkuehlin@hell1og.be.schule.de>

A92: BBS software

From: gussie@alaska.net (Grant Stockly)

A92: Need Help to replace interrupt vectors

From: Vincent Bernardi <bernardi@ibm4.cicrp.jussieu.fr>