James Newtons Massmind <piclist@mit.edu> wrote:

> > you can use the code to correct one-bit errors OR you can use it
> > to detect one- and two-bit errors.  You can't do both, because a
> > two-bit error in one codeword can look identical to a one-bit
> > error in another. 
> 
> I take it that one could not set bit 7 only when there is a
> non-correctable error?

Correct, James.  With my simple Hamming code, it's impossible to 
differentiate between a correctable one-bit error and a non-
correctable two-bit error (or, for that matter, between zero errors 
and three errors).  

-Andy

=== Andrew Warren - fastfwd@ix.netcom.com

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