Hi,
I too have the PM940CNC VS running Mach3. Let us know what you did or if anyone else finds a solution to an improved Software (over Mach3) for the nMotion controller hardware. Some folks rebuild their CNC system for the PM940 to a new controller, but if you are going to this much trouble there is no particular reason to stay with ArtSoft's Mach4.
Thanks, Dave.