3. The printer system of claim 2 wherein a printed line is formed by moving said carrier means for a plurality of passes across said document.
3. The printer system of claim 2 wherein a printed line is formed by moving said carrier means for a plurality of passes across said document. 5. The printer system of claim 3 wherein said printer system includes means for overstriking a sequence of underlying selected characters on a selected line, said overstriking being printed by impacting an overstrike character in a sequence of positions over said selected underlying characters and said overstrike characters being printed in a single pitch whereby said overstrike characters are not in coincidence with underlying characters printed in a different pitch.