>Here are examples for U1 transmitting 1's and 0's to U2.
>
>U1 transmits a '1' to U2:
...
>U1 transmits a '0' to U2:

That is very similar to the TI calculator protocol, but seems to have more 
steps in each exchange. I seem to remember only 4 states for each exchange, 
where Scott has 6. 

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