5. In a system of claim 4 further comprising: line buffer means for storing a line of text including text character codes, control codes, and overstrike codes to be printed; means for transferring one of said lines of text from said text storage buffer to said line buffer.
5. In a system of claim 4 further comprising: line buffer means for storing a line of text including text character codes, control codes, and overstrike codes to be printed; means for transferring one of said lines of text from said text storage buffer to said line buffer. 6. In the system of claim 5 wherein said means for adding overstrike characters comprises means for shifting all codes to the end of said line buffer following an end overstrike control code detected among said codes transferred from said text storage buffer to said line buffer.