JPS55949A - Video display controller - Google Patents
Video display controllerInfo
- Publication number
- JPS55949A JPS55949A JP7400178A JP7400178A JPS55949A JP S55949 A JPS55949 A JP S55949A JP 7400178 A JP7400178 A JP 7400178A JP 7400178 A JP7400178 A JP 7400178A JP S55949 A JPS55949 A JP S55949A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- crt
- channel
- crts
- video signal
- 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
Landscapes
- Digital Computer Display Output (AREA)
Abstract
PURPOSE: To prevent a screen position shift even if several CRTs are connected, by providing a correcting method which equalizes timings between a synchronizing signal and video signal supplied to each CRT as to all CRT.
CONSTITUTION: In the video display controller which controls several CRTs with different display contents by itself, access to a dot pattern signal from character generator CG is attained within one character display cycle in a time division mode and it is assigned to dot registers 7 and 8 of the channel of each CRT. To the output of register 7, delay circuit 31 is connected which delays the signal by a time difference with the output time to register 8, and the common synchronizing signal of both channels and video signal of each channel are inputted to mixer circuits 11 and 12. Consequently, the timing between the synchronizing signal and video signal of each channel can be equalized and the display screen position shift between CRTs 13 and 14 can be prevented.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7400178A JPS55949A (en) | 1978-06-19 | 1978-06-19 | Video display controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7400178A JPS55949A (en) | 1978-06-19 | 1978-06-19 | Video display controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55949A true JPS55949A (en) | 1980-01-07 |
Family
ID=13534390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7400178A Pending JPS55949A (en) | 1978-06-19 | 1978-06-19 | Video display controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55949A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253979A (en) * | 1985-05-02 | 1986-11-11 | Matsushita Electric Ind Co Ltd | Rotary head type magnetic picture recording and reproducing device |
-
1978
- 1978-06-19 JP JP7400178A patent/JPS55949A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253979A (en) * | 1985-05-02 | 1986-11-11 | Matsushita Electric Ind Co Ltd | Rotary head type magnetic picture recording and reproducing device |
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