Hello Jasen,

  JB> if you're dealing with bundled conductors and only one earth
    > conductor a limit of 3m or so is understandable, but if you use
    > twisted pairs or even individually shielded conductors you can
    > go much further before induced noise or crosstalk become
    > problems.

True, but twisted pairs work best with differential drivers and receivers
and typical parallel ports are single-ended.  Note also that a parallel
cable free from trouble due to noise and crosstalk can still suffer from
scew problems, which can worsen with length.

- Andy Ball

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