RE: A89: Re: Keypad detection

To: <assembly-89@lists.ticalc.org>
Subject: RE: A89: Re: Keypad detection
From: "Brady S." <bradys@mailandnews.com>
Date: Fri, 23 Jun 2000 10:42:42 -0600
Importance: Normal
In-Reply-To: <003e01bfdd11$1c3dd4e0$1304a8c0@JB>
Reply-To: assembly-89@lists.ticalc.org


Isn't it also best to disable interrupt 1 in between writing and reading?

-----Original Message-----
From: owner-assembly-89@lists.ticalc.org
[mailto:owner-assembly-89@lists.ticalc.org]On Behalf Of Jean Canazzi
Sent: Friday, June 23, 2000 6:47 AM
To: assembly-89@lists.ticalc.org
Subject: A89: Re: Keypad detection



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: "Jean Canazzi" <jcanazzi@cybercable.fr>

References:

A89: Re: Keypad detection

From: "Jean Canazzi" <jcanazzi@cybercable.fr>