TI-H: Re: checksums and stuff
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TI-H: Re: checksums and stuff
right- but the point of a checksum is that any change in the ROM alters the
checksum-- if the ROM is altered at all, the checksum gets altered. it's
EXTREMELY difficult, if at all possible, to get a checksum to line up again
after the data has been changed, and even if you can do it you have to
actually make the data you inserted -useful-.
--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 1:55 PM
Subject: TI-H: checksums and stuff
>
> Why wouldn't you be able to change anything in the rom without changeing
the
> checksum _CHECKING_ routine. Thats whats in the unchangeble bootloader.
the
> checksum comes _ofcourse_ with the rom, that wants to be installed.
> I think you misunderstood something.
>
> file://Olle
> Nick wrote:
> > 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.
>
>
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