Re: A83: Patching the Ti83+ ROM?

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Re: A83: Patching the Ti83+ ROM?


Yeah, it's possible to edit the OS file in a hex editor before sending it to
a calculator.  The problem is that the calculator wont accept the file
afterwards :)  It uses a complicated validation scheme that you can feel
free to try to crack, but I don't think you'll have any success.

-Dan Englender

----- Original Message -----
From: "Emir Sakic" <saka@hotmail.com>
To: <assembly-83@lists.ticalc.org>
Sent: Saturday, January 27, 2001 1:20 PM
Subject: Re: A83: Patching the Ti83+ ROM?


>
> Right. I forgot that OS is updateable :)
> Maybe it's possible to edit the OS file (base112.8xu) in a hex editor
before
> sending it to calculator?
>
>
>
> >From: "Dan Englender" <dan@calc.org>
> >Reply-To: assembly-83@lists.ticalc.org
> >To: <assembly-83@lists.ticalc.org>
> >Subject: Re: A83: Patching the Ti83+ ROM?
> >Date: Sat, 27 Jan 2001 12:56:14 -0500
> >
> >
> >Well, TIOS is kept in Flash ROM on the TI-83 Plus (otherwise how would
you
> >be able to update your Base code version?).  The trouble is that the
> >calculator does quite a good job of not letting anything (other than TIOS
> >itself) write to the Flash ROM, and of making sure that you don't trick
it
> >into loading something it doesn't want to into Flash ROM.
> >
> >-Dan Englender
> >
> >----- Original Message -----
> >From: "Emir Sakic" <saka@hotmail.com>
> >To: <assembly-83@lists.ticalc.org>
> >Sent: Saturday, January 27, 2001 12:49 PM
> >Subject: Re: A83: Patching the Ti83+ ROM?
> >
> >
> > >
> > >
> > > You can't save anything to ROM so you can't patch it.
> > > The only writable ROM is Flash ROM and TI-OS is not in Flash.
> > >
> > >
> > > >Has anybody already tried to patch the ROM of the Ti83+???
> > > >
> > > >Maybe a simple thing as replacing the _gbufcpy_v routine by FastCopy,
> >is
> >a
> > > >nice point to start?
> > > >
> > > >Then looking for some simple optimizations that can be added, etc.
etc.
> > > >
> > > >
> > > > Henk Poley
> > > >
> > >
> > >
> >_________________________________________________________________________
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> > >
> > >
> >
> >
>
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