Date   : Wed, 25 Oct 2006 12:19:49 +0100
From   : navalenigma@... (Steve O'Leary)
Subject: ADFS sector checksums

> From: jon.welch@...> To: navalenigma@...> CC: bbc-micro 
at cloud9.co.uk> 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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