Printer having print data arithmetic logic

Abstract

A printer includes a controller for providing a sequence control for the printer in its entirety in response to a control signal and a video signal from another controller. A printer head is adapted for latching and printing a printing data signal transmitted from the controller. Print data arithmetic and logic circuitry provides a logical operation processing for video data signals, counting video clock signals transmitted from the controller, and includes storage for storing the video data signals transmitted from the controller, a selector responsive to reference line timing signals for selectively alternately outputting the video data signals, an additional line signal generator for generating from video signals received from the controller, a video data signal representing an additional line destined for between reference lines during an interval of timing, and logical operation circuitry for performing a logical operation for the video data signals read out from the storage and supplying to the printer head the video data signals subjected to the logical operation in the form of the printing data signal.