Who cares about Machine Zero, the machine doesn’t. So why should you? All you need to care about is where the edges of your work material is in X and Y. After that you need to determine the offset for your cutting tool in Z is and what your rapid clearance is. Other than that your machine Co-ordinates don’t mean a damned thing. As long as your using Soft Limits along with Jigs and a Fixture Table and BASIC GCODE!!!.
As far as Not a Stepcraft or whatever other thingy. Mach 3 has been around for over 20 years whereas Easel has been available for what 4 years. On top of that a fair number of Corporations have modified Mach3 to suit their own systems.
And another thing I really don’t appreciate the uninformed comments from a bunch of boobs. Especially considering that I haven’t Flown a Stealth Fighter either. The one thing I do know is that I’ll be damned if I try and help anyone else out of a predicament when their machines electronics go wonky.