Re: A83: Re: Flash App Hacking

Re: A83: Re: Flash App Hacking

• To: <assembly-83@lists.ticalc.org>
• Subject: Re: A83: Re: Flash App Hacking
• From: "Solignac Julien" <x1cygnus@online.fr>
• Date: Sun, 1 Oct 2000 13:50:11 +0200
• Reply-To: assembly-83@lists.ticalc.org

>Another speculation:
>can't we fake the validation part, and then jump to the part where the app
>gets written, or does the validation part involve flash writing too?

This is how the TI-ROM works:

1. Unlock Flash
2. Check If App Is Valid
 If Yes Write
 If Not lock Flash

There is no _unlockflash routine, the required code is implemented directly
before the validation sequence and if it fails flash is locked up. TI has
done a very good job, making it logically impossible to violate the system.
Physically it's another deal.

Solignac Julien
x1cygnus@xcalc.org
http://xcalc.org

Piracy is a victimless crime, like punching someone in the dark

• Re: A83: Re: Flash App Hacking
• From: "David Phillips" <david@acz.org>

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