after loading grbl in uno 3 out of 4 drivers work correctly with my linux system and three nema17 steppers. When trying to test the 4th driver and axis on win7, I noticed that I couldn't communicate with uno. Of course, when you load the CH341SER driver, Windows should recognize the uno USB chip. At the moment I don't have the tools to test this theory, but the intertubes say it works. Other than that, I had no problem recognizing Linux right off the bat. I used bCNC for testing with Linux and everything worked as expected.
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