[GreenKeys] Full duplex KSR interface board

[Trammell Hudson]

Thanks to Doug for two Model 15 KSRs, this weekend I was able to add 
support for 45 baud KSR models in my USB interface board so that they 
show up as full-duplex serial devices:  https://vine.co/v/hnTuKpXtYlu

I'm planning on laying out a PCB for folks who want to make their own 
versions.  It's quite a bit easier to interface with modern hardware 
since all of the code conversion and non-standard serial rate handling 
is done in the dedicated real-time microcontroller.

More details on the current loop interface and boost converter board: 
http://45baud.net/Boost_converter

-- 
Trammell