Proper DDR HDXB support (untested)#4

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Commits on Feb 27, 2017

Proper DDR HDXB support (untested)
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apparantly arduinos start at A2 not A0...
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update readme
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Commits on Sep 20, 2017

add acio broadcast and null satellite emu
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Commits on Sep 21, 2017

Cleanup
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Optimization and documentation
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