Re: A83: The link commands seem not work

To: assembly-83@lists.ticalc.org
Subject: Re: A83: The link commands seem not work
From: Linus Akesson <lairfight@softhome.net>
Date: Sat, 22 May 1999 14:03:52 +0200
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-83@lists.ticalc.org
In-Reply-To: <002201bea446$c92406c0$0d8d8aa4@delmas>
Reply-To: assembly-83@lists.ticalc.org

On 22-May-99, you wrote:

> When I use the "in a,(BPORT)" or "out (BPORT),a" command, my calc crashes or
> it didn't put a correct value to a. What can I do?

> Cédric

The bport has some system control lines other than the link port lines. Don't
change these bits. You can read from the bport to see what the other lines
are set to, because they will always be the same while user asm programs are
executed. This way you can find out what you must or into the accumulator
before writing to the linkport. When reading you just want to read the two
least significant bits, which is why you and by 11b (=3).

Linus
-- 
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| Linus Akesson                                | http://linusworld.cjb.net |
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         I like you. You remind me of when I was young and stupid.

Follow-Ups:

A83: a few quick things

From: Jesse McInturff <jmcintur@bevcomm.net>

References:

A83: The link commands seem not work

From: "M. Delmas" <delmas.temp@wanadoo.fr>

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