Re: A86: 86 interrupts?

To: assembly-86@lists.ticalc.org
Subject: Re: A86: 86 interrupts?
From: David Phillips <electrum@tfs.net>
Date: Tue, 07 Jul 1998 00:50:54 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <35A19EBA.2F835251@flash.net>
References: <1f4c301f.35a172f6@aol.com>
Reply-To: assembly-86@lists.ticalc.org


There are two handy little opcodes you might want to know about:

DI	; disable interrupts
EI	; enable  interrupts

At 12:06 AM 7/7/98 -0400, you wrote:
>
>TGaArdvark@aol.com wrote:
>> All calculators with CBL support (everything except very old TI-85's)
>> have a linkport interrupt.  This is used for silent linking and the trans-
>> fer of variables from a TI-Basic program.  The calculator freezes for
>> a second when you insert a non-tapered link into the linkport because
>> it briefly touches two of the contacts at once.  This sends some bit
>> to the link that makes the calculator wait for data.  After a few
>> seconds, it times out.
>> 
>> In order to use the linkport, you have to use the ROM linkport
>> routines.  Failure to do so would result in random errors triggered
>> by the interrupt.  You would need to disable the interrupts to
>> prevent this.
>
>Thought so. So, where exactly are the link port calls in the 86? I
>remember looking at the code in one of the higher ROM pages but don't
>know exactly how to call that code... does it ret like normal or jp
>somewhere funky?
>
>Failing that... <newbie alert> how do I disable interrupts? Is there
>something in the status register or something?
>
>Thanks, and sorry for the lame "Hi again" =P
>
>Bryan
>
>


// David Phillips
// mailto:electrum@tfs.net
// ICQ: 13811951
// AIM: electrum32

References:

Re: A86: 86 interrupts?

From: TGaArdvark@aol.com

Re: A86: 86 interrupts?

From: Bryan Rittmeyer <bryanr@flash.net>