Re: A89: Writing to Flash ROM

To: <assembly-89@lists.ticalc.org>
Subject: Re: A89: Writing to Flash ROM
From: "Juan Corral" <juancorral@lvcm.com>
Date: Tue, 6 Jun 2000 16:49:57 -0700
References: <200006061234.e56CYES24585@neretvica.utic.net.ba>
Reply-To: assembly-89@lists.ticalc.org


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

References:

Re: A89: Writing to Flash ROM

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