Where is the documentation in Mach that reveals all the exceptions to NIST RS274?
I don't know of a single controlling program out there that has that information in it's manual, but could be wrong....
Mach's Gcode follows the standard rather closely,but, there are manny dialects of Gcode and companies like to have that way.
Try a read of the Mach manual and you will find almost all the Gcodes dellineated.
I can't speak for Brian but heard that the future Gcode will adhear to what the most prominent authority in the world has to say.
Buy a Smid Book.
RICH