13. A unit as defined in claim 12 wherein said transfer means includes a character register connected to said memory means for storing the succession of characters from said memory means and wherein: F. said margin means includes: i. margin register means for storing the predetermined number that establishes the number of display positions on the given line, ii. a character counter connected to said timing means and said margin register means that counts the character codes retrieved from said memory means, iii. comparison means connected to said margin register means and said character counter for indicating an equality when said margin register means and said character counter are equal, and I. said display position recording means includes a position recording register means connected to said delimiter means, said comparison means and said character counter for storing the contents of said character counter each time said delimiter means indicates the retrieval of a delimiter character from said memory means until said comparison means indicates equality whereby said position recording register means records the position of the last delimiter character for the given line, said control means being connected to said position recording register means to cause said transfer means to inhibit the display of characters corresponding to the character codes in said first register following the last delimiter character.
15. A unit as defined in claim 13 wherein said unit additionally comprises a character generator connected to said transfer means and said display means and responsive to the character codes from said transfer means for generating signals to said display means for controlling the display of the characters and said character register comprises a shift register that receives and shifts therein the characters received from said memory means, D. said transfer means additionally including ii. a second shift register connected to said character generator that holds a line of characters corresponding to the characters to be displayed and supplies them serially to said character generator; and iii. means connected to said first and second shift registers and to said control means for coupling the characters in said first shift register into said second shift register, said control means being connected to said position recording register means and said coupling means for blanking from said second shift register the character codes representing characters following the last delimiter character.