JPS54139338A - Character display device - Google Patents
Character display deviceInfo
- Publication number
- JPS54139338A JPS54139338A JP4755178A JP4755178A JPS54139338A JP S54139338 A JPS54139338 A JP S54139338A JP 4755178 A JP4755178 A JP 4755178A JP 4755178 A JP4755178 A JP 4755178A JP S54139338 A JPS54139338 A JP S54139338A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- address
- character
- cpu
- rom
- 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
Abstract
PURPOSE: To obtain a character display circuit which uses a ROM efficiently and economically, by storing program information and character pattern information in the one-system ROM and providing a switch circuit in each of ROM address input and data output.
CONSTITUTION: Assuming that address switch circuit 7, address signal switch circuit 26 and information signal switch circuit 28 are switched to the address bus 5 of CPU 1, the bus 5 side of CPU 1 and the data bus 4 side respectively, character code signals are stored in system character pattern common ROM 27 together with program information. The address of the picture displayed by CPU 1 and character code signals are inputted to character display driving circuit 15 and are stored into character storing RAM 8 in circuit 15. CPU 1 uses control signals to switch circuits 26 and 28 to the RAM 8 side and the parallel-series converter circuit 10 side respectively, and video signals of character display which were subjected to parallel-series conversion are obtained from circuit 10 by address signals from timing pulse generator circuit 6.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4755178A JPS54139338A (en) | 1978-04-20 | 1978-04-20 | Character display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4755178A JPS54139338A (en) | 1978-04-20 | 1978-04-20 | Character display device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54139338A true JPS54139338A (en) | 1979-10-29 |
JPS6115431B2 JPS6115431B2 (en) | 1986-04-24 |
Family
ID=12778288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4755178A Granted JPS54139338A (en) | 1978-04-20 | 1978-04-20 | Character display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54139338A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56154788A (en) * | 1980-04-30 | 1981-11-30 | Sharp Kk | Display signal decoding system |
JPS62240995A (en) * | 1986-04-14 | 1987-10-21 | 株式会社東芝 | Memory |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3760375A (en) * | 1954-05-20 | 1973-09-18 | Sycor Inc | Source data entry terminal |
-
1978
- 1978-04-20 JP JP4755178A patent/JPS54139338A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3760375A (en) * | 1954-05-20 | 1973-09-18 | Sycor Inc | Source data entry terminal |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56154788A (en) * | 1980-04-30 | 1981-11-30 | Sharp Kk | Display signal decoding system |
JPS62240995A (en) * | 1986-04-14 | 1987-10-21 | 株式会社東芝 | Memory |
Also Published As
Publication number | Publication date |
---|---|
JPS6115431B2 (en) | 1986-04-24 |
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