| 摘要 |
PURPOSE:To drop the using frequency of a CPU and to speed up a display on a graphic display compared with a conventional method by holding unupdated data on a part specified by an instruction in a memory part, replacing it with updated data at the time of restoring graphic data and obtaining previous graphic data. CONSTITUTION:Data is stored in an input data area 7, and the control is handed to a distribution routine 2 from a main routine 1. If input data is a restoration processing command, the control is handed to a restoration processing routine 4. It fetches original graphic data before undate out of a file 9, registers it to graphic data in a graphic data area 8, processes the graphic data by a display processing routine 5, and displays said data on a graphic display 10 through an I/O side routine 6. If the input data is not the restoration processing command, the copy of updated original graphic data at a position that the input data specifies is stored on the file 9 from the graphic data area 8, and the control is handed to an execution processing routine 3.
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