Re: A86: Interrupts for the 86

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Interrupts for the 86
From: Wil Mahan <wmahan@asheboro.com>
Date: Sat, 22 Nov 1997 15:08:35 -0500
References: <01BCF77A.54A37300@isdn-a223.itea.ntnu.no>
Reply-To: assembly-86@lists.ticalc.org

Martin Blix Grydeland wrote:
> 
> Sorry, but I'll have to correct myself once more. The last version I
> sent out does actually work!
> 
> -Martin
> 
> Stud. tech. Martin Blix Grydeland, Computer Science NTNU
> E-mail: grydelan@stud.ntnu.no
> Web: http://www.stud.ntnu.no/~grydelan

Thanks, that really helped me to understand interrupts on the 86. But I
still have a few questions:
1. Is there some reason $E2E2 was used for the location, or was it
choosen randomly?
2. Why did you have to fill the whole table with $E2's? Why couldn't you
just modify one interrupt which is called over and over again (for
example a timer interrupt)?
3. The i register holds the high byte of the address of the handler,
right? How did you know it was $E1?

References:

A86: Interrupts for the 86

From: Martin Blix Grydeland <grydelan@stud.ntnu.no>