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Are you using a PC with a 32 bit version of Windows 7 or older? Mach3 can not use the parallel port in 64 bit versions of Windows, or versions newer than Windows 7.

Also, are you plugging a USB cable into the breakout board, or powering it with a 5V power supply?

And if you are using the inputs on that board, you MUST use a 24V power supply for them to work. This should not affect the motors, though.

Can you post a pic of the Mach3 ports and pins, Output Pins page?
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