JPS5592935A - Screen memory control system - Google Patents
Screen memory control systemInfo
- Publication number
- JPS5592935A JPS5592935A JP16523478A JP16523478A JPS5592935A JP S5592935 A JPS5592935 A JP S5592935A JP 16523478 A JP16523478 A JP 16523478A JP 16523478 A JP16523478 A JP 16523478A JP S5592935 A JPS5592935 A JP S5592935A
- Authority
- JP
- Japan
- Prior art keywords
- code signal
- command
- erasing
- screen memory
- screen
- 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.)
- Granted
Links
Landscapes
- Digital Computer Display Output (AREA)
Abstract
PURPOSE: To rewrite the contents of a picture memory into specific codes in a short time by applying the output of a specific code signal generating circuit to a screen memory by switching and then by making use of a direct memory access circuit for write operation.
CONSTITUTION: Specific code signal generating circuit CDG generating space codes is connected to multiplexer MPX-2 and for the erasing of the entire screen, a command is given from microprocessor MPU to command register CMR to change multiplexer MPX-1 over to the direct memory access circuit DMA side while operating screen memory R/W control circuit R/WCC to the write side. At thie time, MPX-2 is switched by a command from CMR to apply the output of CDG to screen memory RAM, and space codes are written in RAM, the contents of which are changed into an all-blank code signal in a short time to complete the erasing operation. For line erasing operation, a line erasing instruction is supplied to MPU to erase a desired line.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16523478A JPS607279B2 (en) | 1978-12-31 | 1978-12-31 | Screen memory control method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16523478A JPS607279B2 (en) | 1978-12-31 | 1978-12-31 | Screen memory control method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5592935A true JPS5592935A (en) | 1980-07-14 |
JPS607279B2 JPS607279B2 (en) | 1985-02-23 |
Family
ID=15808399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16523478A Expired JPS607279B2 (en) | 1978-12-31 | 1978-12-31 | Screen memory control method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS607279B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58154891A (en) * | 1982-03-10 | 1983-09-14 | 松下電器産業株式会社 | Crt controller |
JPS59111686A (en) * | 1982-12-17 | 1984-06-27 | オムロン株式会社 | Crt color display unit |
-
1978
- 1978-12-31 JP JP16523478A patent/JPS607279B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58154891A (en) * | 1982-03-10 | 1983-09-14 | 松下電器産業株式会社 | Crt controller |
JPS59111686A (en) * | 1982-12-17 | 1984-06-27 | オムロン株式会社 | Crt color display unit |
Also Published As
Publication number | Publication date |
---|---|
JPS607279B2 (en) | 1985-02-23 |
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