I've been searching around in the Mach2 demo and I like most of what I've seen. I think I might even understand almost all the setup parts (Mr. Optimist!).
What I don't see though is anything about drilling? I'm going to be making PCBs so drilling is actually the most important part for me - I can etch good boards instead of milling if needed but, the drilling is mucho-desirous of CNCing...
Can you/How do you get from Excellon to drilled holes using Mach2?