Re: A86: Hooking interrupt idea

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Hooking interrupt idea
From: Jimmy Mårdell <mja@algonet.se>
Date: Thu, 30 Oct 1997 00:26:17 -0800
References: <971029002605_-1392909324@emout08.mail.aol.com>
Reply-To: assembly-86@lists.ticalc.org

Steve86Asm@aol.com wrote:
> 
> In a message dated 97-10-28 17:28:37 EST, you write:
> 
> >
> >  > Also, what is this interrupt handler at 38H?  When does it get called?
> >
> >  Every time an interrupt occurs. In IM 1, which is default on the TI-8x
> >  calcs,
> >  a call to 38H is made.
> >
> 
> ok, so when do interrupts occur?

About 195-200 times/second (it depends on battery strength) if IFF1=1
(ie,
interrupts enabled) _OR_ when you press the ON button. An interrupt
occurs
when you press the ON button even if interrups are disabled.

Interrupt do NOT occur faster on a turboed calc. That's why programs
using
HALT to delay aren't much faster on turboed calcs.

-- 
Jimmy Mårdell                "The nice thing about standards is that 
mailto:mja@algonet.se         there are so many of them to choose from."
http://www.algonet.se/~mja    
IRC: Yarin                   "Sanity? I'm sure I have it on tape
somewhere!"

References:

Re: A86: Hooking interrupt idea

From: Steve86Asm@aol.com