JPS6437594A - Data updating system for display memory - Google Patents
Data updating system for display memoryInfo
- Publication number
- JPS6437594A JPS6437594A JP62193974A JP19397487A JPS6437594A JP S6437594 A JPS6437594 A JP S6437594A JP 62193974 A JP62193974 A JP 62193974A JP 19397487 A JP19397487 A JP 19397487A JP S6437594 A JPS6437594 A JP S6437594A
- Authority
- JP
- Japan
- Prior art keywords
- display
- plotting
- address
- rewritten
- sends
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To prevent flickering of display in a display screen especially in the case that the speed at which data is written in a display memory is higher than the period of one-frame raster scanning by displaying rewritten display data at least once. CONSTITUTION: A latch circuit 11 holds a plotting address, that a plotting processor 6 sends to a bit map memory 9, and holds the last plotting address of a series of display data rewritten by the plotting processor 6. A comparison circuit 12 compares the address held in the latch circuit 11 with a display address for read of display data, which is sent from a CRT control circuit 7, and sends a coincidence signal in the case of coincidence. A counter 13 counts the signal sent from the comparison circuit 12, and when the counted number reaches a prescribed value, the counter sends a signal to the plotting processor 6 so that it will start the write processing of a series of next display data. Consequently, rewritten blocks are certainly displayed even if the plotting speed at which display blocks are expanded in the display memory is high. Thus, flickering of the picture is prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62193974A JPS6437594A (en) | 1987-08-03 | 1987-08-03 | Data updating system for display memory |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62193974A JPS6437594A (en) | 1987-08-03 | 1987-08-03 | Data updating system for display memory |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6437594A true JPS6437594A (en) | 1989-02-08 |
Family
ID=16316871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62193974A Pending JPS6437594A (en) | 1987-08-03 | 1987-08-03 | Data updating system for display memory |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6437594A (en) |
-
1987
- 1987-08-03 JP JP62193974A patent/JPS6437594A/en active Pending
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