>I'm sure y'all can improve on this; suggestions,
>counter-arguments, insults, etc. are all welcome.

Well, for the distance you were talking of doing this over originally, I 
cannot see the need for this complexity to get it down to one wire, from the 
two wire of the TI-calculator system. It seems to me that it may possibly 
need more processor overhead as well, without going to the extent of a 
worked example. 

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