Those 'dummy' wires are for grounding out each pin.  Allows for less signal 
noise. (Just basically as you said.. but the wires are for grounding) so each 
pin has a ground connection.

On Wednesday 15 August 2001 15:08, Tom Brinkman wrote:
>     BTW, an ata/100 capable cable has 80 wires .... but only 40
> conductors. The other 40 are 'dummy' wires.  Puddin again, there's
> still only 40 pins on the ends of a 80 wire cable.  The other 40 are
> spread in between as seperators to lower signal inductance (noise).
> A computer is just another kinda radio.

-- 
Leif Madsen
Plan-Net Technologies
http://www.plannettechnologies.com
Registered Linux User: #219104
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