Re: A89: Re: Keypad detection

To: assembly-89@lists.ticalc.org
Subject: Re: A89: Re: Keypad detection
From: Jean Canazzi <jcanazzi@cybercable.fr>
Date: Sat, 24 Jun 2000 00:00:02 +0200
References: <20000623202244.A43CCA402E@towerguard.edu.sollentuna.se> <003701bfdd59$fe3e8040$e902e0c7@Pnoveck>
Reply-To: assembly-89@lists.ticalc.org

Scott Noveck wrote:
> 
> IF YOU WANT TO READ FROM THE KEYBOARD PORT DIRECTLY, YOU MUST ALWAYS DISABLE
> AUTO-INTERRUPT ONE WHEN DOING SO!  FAILURE TO DO SO WILL CAUSE THE MASK
> WRITTEN TO ($600019) TO BE REPLACED BY TIOS, AND THE OUTPUT WILL BE
> INCORRECT!

I'm sorry but this is not exactly true. The mask will NOT ALWAYS be
replaced by the TiOS. I know that, because in the first versions of
Bigdyna, I didn't disable autoint 1, and it still worked very well. So I
can guaranty you that is is not absolutely necessary.

References:

From:

A89: Re: Keypad detection

From: "Scott Noveck" <noveck@pluto.njcc.com>

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