Re: TI-H: Re: Re: Melody of TI CALC comment and questions
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Re: TI-H: Re: Re: Melody of TI CALC comment and questions
well then, suck, because there's no way you're going to implement useful
changes to the rom without changing the checksum- any decent checksum will
be altered by any byte change in the original.
--nick
Nick Foster / Bistromath / zaphod@coe.neu.edu
KeyID 2048/1024 0x663CB446
6CAF FFD4 F9BA 64BA ECF9 032E 7402 3886 663C B446
----- Original Message -----
From: "Olle Hedman" <oh@hem.passagen.se>
To: <ti-hardware@lists.ticalc.org>
Sent: Thursday, February 10, 2000 12:29 PM
Subject: Re: TI-H: Re: Re: Melody of TI CALC comment and questions
>
> Nick wrote:
> >
> > yeah, but where is the checksumming routine kept.....?
> >
>
> If you mean in the calc to check if the checksum is right, it is in the
> bootloader, and that is unchangeble. (without soldering Iron)
> even if it was in ordinary changeble flash, it wouldn't make any
difference..
> think about it.. ofcourse it checks the rom before it is installed. And
then
> your changes have not had any effect.
> To generate is no problem. To encrypt it afterwards is impossible without
TI:s
> private key.
>
> file://Olle
>
>
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