Re: A86: Hooking interrupt idea

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Hooking interrupt idea
From: Steve86Asm <Steve86Asm@aol.com>
Date: Sun, 2 Nov 1997 21:04:22 EST
Organization: AOL (http://www.aol.com)
Reply-To: assembly-86@lists.ticalc.org

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...

~Steve

Follow-Ups:

Re: A86: Hooking interrupt idea

From: MrManson <joemama@minot.com>

Re: A86: Hooking interrupt idea

From: Jimmy Mårdell <mja@algonet.se>