Abstract: Coincident current windings on a magnetic print head are driven in a special sequence to minimize undesired spurious printing effects otherwise caused by undesirable concentrations of magnetic flux. Rather than energizing all digit windings (in accordance with supplied data values) for each successive energization of a word winding, the digit windings are driven in multiple sub-sets or groups. Only one such sub-set is energized at any given time and the members of each sub-set are chosen to minimize undesired spurious magnetic flux distributions for any given magnetic printing head configuration.

Abstract: Data transfer and control apparatus for coupling between a data source having a first character per second rate of delivery of coded pulse groups each representing a character and a recorder for recording data in blocks of a fixed number of characters at a second character per second rate comprising an incremented data storage register; an incremented tag signal storage register; means for applying coded pulse groups to said register from said source; means for providing tag signals, associated with respective applied coded pulse groups, to said tag signal register; means for incrementing said applied pulse groups and associated tag signals synchronously in their respective registers at a third character per second rate.