Ah, I recognize some of this from a different thread. If there is a GRBL post processor, that would be the closest to the present Maslow gcode set. That said, the file runs, doing the expected z-axis changes and spindle controls and cuts a 100mm circle in the clockwise direction.
The codes that I see which not currently implemented:
G17 - select the XY-plane. Maslow only works in the XY-plane, so this is ignored
G54 - select work offset #1. Maslow doesn’t currently implement work offsets, so this is ignored
G40 - turn cutter radius compensation off, cutter travels on programmed path. This is assumed in the Maslow firmware. Gcodes G41 and G42 for radius compensation are not implemented. G40, G41 and G42 are ignored
G49 - use no tool length offset. This is assumed in the Maslow firmware. Gcodes G43 and G44 for tool length offset are not implemented. G43, G44 and G49 are ignored
G80 - cancel modal motion. Terminates all canned cycles, clears the current G0, G1, G2 or G3 mode, so this must be re-established for the next move that is required. Canned cycles are not implemented. Clearing the current G0, G1, G2 or G3 mode is a possible use, though not currently implemented
The M3 and M6 gcodes are implemented, but the S parameter is ignored as the Masalow cannot control the spindle speed.