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The new Proffieboard v3.9 now uses a new CPU. The new CPU runs at the same speed and mostly the same as the old CPU on Proffie v2.2, but it has a few important differences: More RAM, FLASH and pins!
User manual can be found here.
Here is a list of improvements for Proffieboard V3.9 over the v2.2:
More FLASH (512kB instead of 256kB): Thi
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They arrived fast, well packaged and in great condition. Will definitely be ordering more.