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Questions regarding UMO firmware

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I'm re-onfiguring Marlin for my mildly modified UMO. None of the builders I could find address the aspects that make my machine unique, or provide a configiration.h file that I can further edit for my particularities. I've done some searching for my issues below without success. If anyone knows the following, your help will be greatly appreciated.

I would like to backup my currently loaded firmware from the machine in case I mess up a new version. Possible?

Are the end stop i/o inputs on the 1.5.7 board interupt capable? Newer branches of Marlin can take advantage of this if it can.

Has anyone explored the Marlin feature called linear advance? It's billed as sort of like coasting, but better.

Yes, @mechaneil, manually editing Marlin is a bit overwhelming. It's been a couple years since I did. The Marlin home page is a great reference.

Matt

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