[GreenKeys] ZZZZ or ZCZC?

[Jim Haynes]

In some of the W.U. Plan 55 logic the required end of message was
LF preceding the NNNN


On Wed, 16 Oct 2019, Sheldon Daitch via GreenKeys wrote:

> Years ago, on the VOA RTTY circuits, we used FAXFAX as the start of tape
> punching code.  
> 
> NNNN was used to turn off the tape punch, but actually, the coding was NNN,
> but all four Ns
> were used, in the event of a garble.