Abstract: In a printer control apparatus having a two-dimensional address type full dot memory, this full dot memory is constituted by a longitudinal/lateral-direction highspeed memory with a highspeed access operation along an x address direction, an oblique-direction highspeed memory with both access speeds in x address and y address direction, and another longitudinal/lateral-direction highspeed memory with a highspeed access operation along a y address direction. A directivity of a dot pattern is judged by a memory control unit, and this dot pattern is expanded from print data by a data processing unit, and then is written into a full dot memory. Any one of the longitudinal/lateral-direction highspeed memory, the oblique-direction highspeed memory, and the longitudinal/lateral-direction highspeed memory is selected based on the directivity judgment result to expand the dot pattern into the selected memory.

Abstract: The line size of character lines constituting a page of print paper is compared with the limited line size. If a line has its line size larger than the limited line size, it is divided into several lines having a smaller line size. An edit control circuit appends a divisional character code to each divided portion of a character which is divided into several lines. An expansion control circuit receives a divisional character code, extracts the divided portion of the character from the patterns of available characters and writes it into a line buffer memory. Patterns in the line buffer memory are written sequentially into a page memory which stores patterns of characters printed in a page of print paper.