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If you are going to run Windows 10 then you can't use the parallel port on any PC with Mach3, so you must use some kind of external motion control hardware. Something like UC100 is the most basic of...

GRBL is motion control software that runs on Arduino. It takes in gcode - think "move cutter to X=10, Y=25" coordinate-type instructions. It turns these into the pulses that the motors need to move...