Re: A89: interrupts

To: assembly-89@lists.ticalc.org
Subject: Re: A89: interrupts
From: Olle Hedman <oh@hem.passagen.se>
Date: Sat, 12 Dec 1998 03:27:22 +0100
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
References: <00f201be2573$c610a940$5f10e6a5@Sammy.rutgers.edu>
Reply-To: assembly-89@lists.ticalc.org


You can't disable auto int 2 without disabling int 1 with just setting the mask
no..  but you can change only the int 2 vector without changeing the int 1
vector.. (removeing the move.l #int,($64) line...)

btw..  auto int 7 is not only generated when writing to $64.. infact it is
generated when writing to any address below $120

(all this can be read in the fargo-documentation btw...)

//Olle

Dux Gregis wrote:
> ok, so you can't disable auto int 2 without also disabling auto int 1, then?
> 
> I'll try doing this:
> 
>  move.w #$700,d0            ;temporary interrupt mask
>  trap #1                                ;call supervisor program to enable
> it
>  move.l $64,(old_int)        ;save old interrupt 1 address
>  bclr.b #2,($600001)        ;clear bit that generates auto 7 interrupt when
> writing to ($64)
>  move.l #int,($64)                ;new interrupt 1 address
>  move.l #int2,($68)            ;new interrupt 2 address
>  bset.b #2,($600001)        ;then set it again
>  trap #1                                ;replace temporary mask with old
> mask
> 
> int2:                                    ;dummy interrupt handler
>  rts

References:

Re: A89: interrupts

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

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