On Wed, 1 Dec 1999, Jon Purcell wrote:
> This request is certainly a blast from the past - I don't
> think I've done a Modulex 11 check since the late 70's.
> >From memory you take each digit of the ISBN and multiply it
> thus (presuming that you have a complete 10 digit ISBN.
> Where the ISBN is only 9 digits as in your example, it used
> to be normal practice to add an additional 0 to the number.
> I have added an extra 0 to your ISBN)
I think you have misunderstood Tracy's question. She gave us the first
nine digits of the ISBN and wanted to know what the check digit should be.
It was not a complete ISBN that needed checking.
It is true that when the British SBN system was extended to form an
international standard, all nine-digit SBNs were converted to an ISBN by
prefixing a zero (which of course does not affect the check digit).
Other than that misunderstanding, your method was quite correct.
Incidentally, does anyone know whether those who designed the British SBN
system envisaged from the start how it could be extended to form an
international standard?
Matthew Phillips
Assistant Librarian
Christ Church Library
Oxford
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