JPS54105436A - Display unit for character or the like - Google Patents
Display unit for character or the likeInfo
- Publication number
- JPS54105436A JPS54105436A JP1215578A JP1215578A JPS54105436A JP S54105436 A JPS54105436 A JP S54105436A JP 1215578 A JP1215578 A JP 1215578A JP 1215578 A JP1215578 A JP 1215578A JP S54105436 A JPS54105436 A JP S54105436A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- period
- waveform
- memory
- character
- 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 make it possible to reduce flickering, and also to rewrite a memory without synchronizing with a raster scan, by temporarily intermitting a video output when writing or reading data to or from the display memory.
CONSTITUTION: At the time of access from a CPU to display memory MEM, selector SEL is changed over by select signal Al4(d) to supply address lines A0 to A8 as address of MEM. Since unneeded data are outputted from character generator CG [output waveform (a)] at this time, however, signal Al4(d) is passed through inverter (i), capacitor C1 and resistance R1 to obtain waveform (b) and the signal of waveform (b) is then inputted AND gate (g), where character pattern signal (a) from CG is eased for period VDO.OFF longer than memory access period MACSS, and outputted from gate (g), thereby removing unneeded data. No inneeded flickering will therefore appear on the screen in this period.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1215578A JPS54105436A (en) | 1978-02-06 | 1978-02-06 | Display unit for character or the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1215578A JPS54105436A (en) | 1978-02-06 | 1978-02-06 | Display unit for character or the like |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54105436A true JPS54105436A (en) | 1979-08-18 |
Family
ID=11797564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1215578A Pending JPS54105436A (en) | 1978-02-06 | 1978-02-06 | Display unit for character or the like |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54105436A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6457290A (en) * | 1987-08-28 | 1989-03-03 | Seiko Epson Corp | Color image display device |
JPS6462691A (en) * | 1987-09-02 | 1989-03-09 | Hudson Soft Co Ltd | Flickering preventor for screen of video signal generator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5233430A (en) * | 1975-09-10 | 1977-03-14 | Nec Corp | Display control system |
-
1978
- 1978-02-06 JP JP1215578A patent/JPS54105436A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5233430A (en) * | 1975-09-10 | 1977-03-14 | Nec Corp | Display control system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6457290A (en) * | 1987-08-28 | 1989-03-03 | Seiko Epson Corp | Color image display device |
JPS6462691A (en) * | 1987-09-02 | 1989-03-09 | Hudson Soft Co Ltd | Flickering preventor for screen of video signal generator |
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