Re: A86: Hooking interrupt idea

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Hooking interrupt idea
From: MrManson <joemama@minot.com>
Date: Sun, 02 Nov 1997 21:09:46 -0600
References: <bef73e5f.345d30f9@aol.com>
Reply-To: assembly-86@lists.ticalc.org

Steve86Asm wrote:
> 
> In a message dated 97-11-01 18:54:47 EST, you write:
> 
> >
> >  > One more thing....  Are you saying that it jumps to 38H _every_ time ON
> is
> >  > pressed, or just if it's off.  Also, do the interrupts occur 195-200 /s
> > even
> >  > when running asm programs?  That would mess up the program that's
> running,
> >  > wouldn't it?
> >
> >  The CPU is (I think) still executing assembly instructions when you turn
> >  off
> >  the calculator (not when you remove the batteries of course). And yes,
> >  every
> >  time you press the ON key an interrupt occurs (if IFF1=1). Since the
> >  processor
> >  is always active when there are batteries in the calc, there is no
> >  reason to
> >  believe it would treat the ON key different when it's turned off.
> >
> >  The interrupt frequency is a hardware thing and is impossible to change;
> >  ie, asm programs have nothing to do with it.
> >
> 
> What I was referring to was this:  Does it jump to 38H about 200 times per
> sec, even if you're running an ASM program, with interrupts enabled?  If so, I
> would think that it would _drastically_ slow it down, or that it would even
> mess up the registers, etc...

yeah it seems kind of useless running it all the time, maybe a flag
turns it off? then again its for protection in programs so maybe not

Follow-Ups:

Re: A86: Hooking interrupt idea

From: Dan Eble <eble@cis.ohio-state.edu>

References:

Re: A86: Hooking interrupt idea

From: Steve86Asm <Steve86Asm@aol.com>