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Hello David,

Either will work with the parallel port. It is difficult to get these photo interrupters to work because the depth of the channel is usually too deep for a guide to pass through and block the beam. You are better off using a discrete IR emmiter & phototransistor pair that can be put directly below the braid or copper. You will have much better success with that format. Nothing wrong with the dead strip or light bridge methods either. Dead strip on a straight is very reliable and the light bridge works very well too.

good luck,

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