In the process of building my own homebrew pendant to work with Mach3 on my small Sherline mill. It uses a PIC to simulate the quadrature signal normally associated with regular MPG... Tested the code last night and it works fine... no add-on required thus it will work with any version of Mach3...
It has 4 dedicated buttons for Axis +, Axis -, Axis Select and MPG Mode. A visual confirmation of selected axis (X, Y, Z) and mode (X1, X10, X100, continuous) via LEDs. The remaining 9 switches are wired but actual functions are configured in Mach3... Power is taken from USB port...
Will be working on suitable casing tonight (if I can find the time)... :rainfro:
I'll provide more photo and details at my blog