Re: A89: Writing to Flash ROM
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Re: A89: Writing to Flash ROM
yea, it was quite easy. just archive a variable and unarchive it in a fast
loop... burns it out
----- Original Message -----
From: "Cassady Roop" <croop@oregontrail.net>
To: <assembly-89@lists.ticalc.org>
Sent: Wednesday, June 07, 2000 11:21 PM
Subject: Re: A89: Writing to Flash ROM
>
> Hasn't there been a 'virus' for the 89 already? I seem to remember a
> so-called 'virus' program was written in BASIC for HW1 that just wrote
> to the Flash so many times it fried... at least in theory...
>
> Cassady Roop
>
> Julian Stoev wrote:
> >
> > I wonder when are we going to see the first virus for TI89?
> > ;)
> >
> > BTW, I think keeping such sources "secret" will not help at all.
> > There is no security with obscurity. I think the best thing to avoid
> > problems is to make information widely available to *any* user.
> >
> > I remember how virus things started in the old PC world - undocumented
> > BIOS and interrupt functions and relatively few real tools to explore
> > the situation.
> >
> > --JS
> >
> > On Wed, Jun 07, 2000 at 08:22:44AM +0200, Zeljko Juric wrote:
> > |
> > |Hi!
> > |
> > |> Thanks to all who responded. I did finally write to
> > |> the flash rom by following what Zeljko Juric
> > |> suggested. I did not get my specific program to work
> > |> because the flash protection cannot be disabled in the
> > |> area that I was writing to. (The block that the first
> > |> part of the AMS code is in also contains the
> > |> certificate. I figure that TI doesn't want people to
> > |> erase that block with the block erase command.) Olle
> > |> Hedman was correct when he said that corrupting this
> > |> block could ruin the calc. But gladly we don't have
> > |> to worry about that :-)
> > |
> > |I strongly recommend for anybody who succeeded to write
> > |anything into the Flash ROM to keep source of such
> > |routines exclusively for internal purposes, and not to
> > |release them to the public. Giving such sources to the
> > |public is equal like giving an atomic bomb to an idiot.
> > |These sources may be misused disasterously!!!
> > |
> > |Zeljko Juric
>
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