JPS5494232A - Control system for cathode ray tube display unit - Google Patents
Control system for cathode ray tube display unitInfo
- Publication number
- JPS5494232A JPS5494232A JP86978A JP86978A JPS5494232A JP S5494232 A JPS5494232 A JP S5494232A JP 86978 A JP86978 A JP 86978A JP 86978 A JP86978 A JP 86978A JP S5494232 A JPS5494232 A JP S5494232A
- Authority
- JP
- Japan
- Prior art keywords
- period
- input
- crt
- display
- output unit
- 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
- Image Generation (AREA)
- Digital Computer Display Output (AREA)
Abstract
PURPOSE:To make easy the access from other input and output unit, by providing the usage condition judging means for CRT refresh memory at the bus control. CONSTITUTION:When the input and output unit such as printer and disc connected via the adaptors 6 and 7 delivers the access request to the CRT refresh memory 3 via the bus 9, the bus control 2 judges whether CRT 5 performs character display or not, and when it is known that the period not performing character display is present, permission signal is given to the input and output unit performing request. The period not performing display is the horizontal and vertical blanking period for CRT scanning, and the display period between characters or picture display entirely inhibited period etc. Those input and output units can directly access the main memory 8 through DMA not via the computer 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP86978A JPS6053876B2 (en) | 1978-01-10 | 1978-01-10 | Cathode ray tube display device control method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP86978A JPS6053876B2 (en) | 1978-01-10 | 1978-01-10 | Cathode ray tube display device control method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5494232A true JPS5494232A (en) | 1979-07-25 |
JPS6053876B2 JPS6053876B2 (en) | 1985-11-27 |
Family
ID=11485668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP86978A Expired JPS6053876B2 (en) | 1978-01-10 | 1978-01-10 | Cathode ray tube display device control method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6053876B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59116846A (en) * | 1982-12-23 | 1984-07-05 | Matsushita Electric Ind Co Ltd | Controller of central processing unit |
-
1978
- 1978-01-10 JP JP86978A patent/JPS6053876B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59116846A (en) * | 1982-12-23 | 1984-07-05 | Matsushita Electric Ind Co Ltd | Controller of central processing unit |
Also Published As
Publication number | Publication date |
---|---|
JPS6053876B2 (en) | 1985-11-27 |
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