Date   : Wed, 25 Oct 2006 12:19:49
From   : Steve O'Leary <navalenigma@...>
Subject: Re: ADFS sector checksums

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> From: jon.welch@...> To: navalenigma@...> CC:
bbc-micro@...> Subject: Re: [BBC-Micro] ADFS sector checksums> Date:
Wed,
25 Oct 2006 12:08:33 +0100> > > From: Steve O'Leary
<navalenigma@...>> > > Now I know I'm miss-interpreting somewhere
...> > You need to
calculate the crc going backwards from byte 254 to byte 0. This will give the
correct crc of 0x29.> > Regards,> > Jon.

Jon, your tops, should have looked at the code a lot more closely than I
obviously did ! I saw the backwards count and it didn't register (sometimes
not much does !). It was the basic premise that you sum the bytes that led
me to just presume it was done in a kind of human way rather than the
obvious way for the machine - which is of course to always count down as it's
slightly more efficient.
 
Thanks,
Steve.
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