As I recollect RY is an alternating Mark Space combination in order to set
the limits for cortrect printing. When a RY sequence is sent, the Ranger
finder is adjusted to the limits of good print and then adjusted to be set
in the middle of that range.
For many years I used a model 19 and associated equipment.
LTRS which is all marking was used by the tape punch to correct for any mis
typing which I used a lot...
Personaloly I don't like the Diddle feature...
The Baudot code follows as can be found in :
http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?Baudot
R 01010
Y 10101
LTRS 11111
Dave W7DPW
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