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PC Parallel Port Wizard

This simple gizmo can test your PC's parallel port. It can also teach you a lot about the way parallel ports operate.

By Trent Jackson

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Getting stuck with a fault in the parallel port of today's computers can be a pain. Wouldn't it be nice to have a simple port tester to check it out. Before you pick up that bargain at the flea market or swap-fest, plug in this Wizard and it will tell you if everything is as it should be.

But the Parallel Port Wizard is more than a port testing device. It's also a learning aid. And it's cheap and simple to build. It's a combination of some DOS software and a handful of common components - but it enables you to test and analyse every I/O pin in a standard parallel printer port.

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