Re: A89: Writing to Flash ROM

To: <assembly-89@lists.ticalc.org>
Subject: Re: A89: Writing to Flash ROM
From: "Kevin Goodsell" <goodsell@bridgernet.com>
Date: Tue, 6 Jun 2000 21:23:37 -0600
Reply-To: assembly-89@lists.ticalc.org


MaxMem doesn't have any use on HW2 calcs. They already have maximum memory.

-Kevin

-----Original Message-----
From: Juan Corral <juancorral@lvcm.com>
To: assembly-89@lists.ticalc.org <assembly-89@lists.ticalc.org>
Date: Tuesday, June 06, 2000 5:50 PM
Subject: Re: A89: Writing to Flash ROM


>
>Are you saying that MaxMem works on HW2 calcs?
>
>Juan
>TI-Net @ http://www.tinews.net
>
>----- Original Message ----- 
>From: "Zeljko Juric" <zjuric@utic.net.ba>
>To: <assembly-89@lists.ticalc.org>
>Sent: Tuesday, June 06, 2000 5:37 AM
>Subject: Re: A89: Writing to Flash ROM
>
>> On HW2 calcs, enough good place does not exist even in the
>> garbage, so it seems that on HW2 calcs protection breaking
>> is impossible. But it is still possible. You need to force
>> archive memory garbage collection, which will display
>> a confirmation dialog. Before this, you need to set the
>> display address (using PortSet) to point over the table of
>> interrupt vectors, so drawing a dialog will screw up 
>> interrupt vectors. During waiting for a keypress (in the 
>> confirmation dialog), TIOS executes trap #1. This was their
>> BIG mistake. If vectors are "screwed up" correctly, this 
>> allows your routine to be executed while flash protection 
>> is off (you guess, it is off while confirmation dialog is 
>> on the  screen). This is what HW2 patch and MaxMem made by
>> Julien Muchembled really do.
>> 
>> Zeljko Juric
>
>