[GreenKeys] Avarda ITTY Feed / StayShift-On-Space

[John Nagle]

    If this is a problem, I'd suggest making the sending software 
indifferent to unshift-on-space.  My "baudotrss" does this. The
logic is



     Next char   Prev state  New state   Send    Notes

     letter      LTRS        LTRS
     letter      FIGS        LTRS        LTRS
     letter      UNKNOWN     LTRS        LTRS   	State UNKNOWN, shift

     figure      LTRS        LTRS        LTRS
     figure      FIGS        FIGS
     figure      UNKNOWN     FIGS        FIGS    State UNKNOWN, shift

     space       LTRS        LTRS
     space       FIGS        UNKNOWN             Don't know state now
     space       UNKNOWN     UNKNOWN

     LTRS        any         LTRS
     FIGS        any         FIGS
     LF, CR      any         no change
     BLANK       any         no change



The key here is the UNKNOWN state.  When in UNKNOWN state, and
LTRS or FIGS state is needed, LTRS or FIGS must be sent.
When a SPACE is seen in FIGS state, the state becomes UNKNOWN,
because we don't know the state of the received machines.

The effect is that every space followed by a figure has
a FIGS inserted. Then it doesn't matter whether the receiving machine
has unshift-on-space.

				John Nagle