PURPOSE: To allow inexpensive execution of graphic cursor display without using the hardware to be exclusively used for this display by writing the pixel data on the characters and graphics existing in a display region into a plotting memory and writing the pixel data on the characters and graphics existing in the display region into a saving memory.
CONSTITUTION: An in-cursor region plotting section 107 is started by a plotting control section 105 and the characters and graphics after updating are decided in pixel unit. The characters and graphics in the region where the graphic cursor C is currently displayed are written into the saving memory 103. More specifically, the plotting corresponding to the mask part is so controlled as to be written into the saving memory 103 by executing the address conversion from the masked part to the saving memory 103 in an off-cursor region plotting section 106 on a plotting memory 101. The graphic cursor display is executed inexpensively without using the hardware to be exclusively used for the graphic cursor display in this way.
HASHIZUME TATSUO
TSUGE AKIRA
KOBAYASHI MASAAKI
