8. A unit as recited in claim 7 wherein said detector means comprises: a. margin register means containing a number indicating a selected maximum line length that defines a line-ending margin position, and b. comparison means connected to said margin register means and said first counter means for generating the margin signal for said control means when the number in said first counter means corresponding to the number in said margin register means.
8. A unit as recited in claim 7 wherein said detector means comprises: a. margin register means containing a number indicating a selected maximum line length that defines a line-ending margin position, and b. comparison means connected to said margin register means and said first counter means for generating the margin signal for said control means when the number in said first counter means corresponding to the number in said margin register means. 9. A unit as recited in claim 8 wherein said storage means in said detector means comprises second counter means connected to said first counter means and said timing means, said timing means altering the number in said second counter means and said control means generating an inhibit signal when said second counter means contains a predetermined number, the inhibit signal inhibiting the transfer of succeeding character codes by said transfer means to said display means.