A89: Re: Keypad detection

To: <assembly-89@lists.ticalc.org>
Subject: A89: Re: Keypad detection
From: "Jean Canazzi" <jcanazzi@cybercable.fr>
Date: Fri, 23 Jun 2000 14:46:54 +0200
References: <200006220555.e5M5tv627129@neretvica.utic.net.ba> <000e01bfdd0e$69d65cc0$702bfea9@telak>
Reply-To: assembly-89@lists.ticalc.org


There is a little error :

> move.b  #%1111011,($600019)

To test the '9' key, change this to :
move.b  #%1110111,($600019)

> and sometimes when a lot of keys in the vicinity of the 9 key is pressed

Here is the explanation to this, from IO-ports.txt :

<<<
Because of the way the TI89/TI92+ 's keyboard is wired, if you hold down
three
keys that form the corners of a rectangle, the TI89/TI92+ will think you are
also holding down the key at the fourth corner.
>>>

So for example if you press '5', '6' and '8' at the same time, '9' will also
be detected.

Follow-Ups:

RE: A89: Re: Keypad detection

From: "Brady S." <bradys@mailandnews.com>

References:

Re: A89: Re: Re: Folder List

From: "Zeljko Juric" <zjuric@utic.net.ba>

A89: Keypad detection

From: "Andreas Wahlin" <dungeon.master@spray.se>