JPS54139433A - Decision system for end of writing - Google Patents
Decision system for end of writingInfo
- Publication number
- JPS54139433A JPS54139433A JP4657778A JP4657778A JPS54139433A JP S54139433 A JPS54139433 A JP S54139433A JP 4657778 A JP4657778 A JP 4657778A JP 4657778 A JP4657778 A JP 4657778A JP S54139433 A JPS54139433 A JP S54139433A
- Authority
- JP
- Japan
- Prior art keywords
- writing
- display
- period
- cpu1
- crt
- 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 secure an assured writing by making use of the non-display period by using the timing pulse which decides the display and non-display periods of the CRT to confirm the writing which is carried out during the non-display period.
CONSTITUTION: The information to be displayed on the CRT screen is written into refresh memory 5 from the input source such as CPU1 and others. To perform this writing during the non-display period, CPU1 performs the address designation for reading circuit 11 and then reads out display timing pulse DISPTMG to decide whether the writing period or not. In case the writing is possible the address data is sent out for memory 5 to carry out writing. After this, the reading and writing actions are confirmed for DISPTMG to complete the writing acation. Thus, the display timing is secured at the time when the data is sent to memory 5 from CPU1, and the disagreement of the data is prevented caused by the automatic stop of the writing action. During the non-display period, the blanking period of the horizontal and vertical timing pulses of the CRT display unit is utilized.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4657778A JPS54139433A (en) | 1978-04-21 | 1978-04-21 | Decision system for end of writing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4657778A JPS54139433A (en) | 1978-04-21 | 1978-04-21 | Decision system for end of writing |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54139433A true JPS54139433A (en) | 1979-10-29 |
JPS6140997B2 JPS6140997B2 (en) | 1986-09-12 |
Family
ID=12751147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4657778A Granted JPS54139433A (en) | 1978-04-21 | 1978-04-21 | Decision system for end of writing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54139433A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60173580A (en) * | 1984-02-20 | 1985-09-06 | 株式会社アスキ− | Display controller |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01137294U (en) * | 1988-03-07 | 1989-09-20 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5023769A (en) * | 1973-06-12 | 1975-03-14 |
-
1978
- 1978-04-21 JP JP4657778A patent/JPS54139433A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5023769A (en) * | 1973-06-12 | 1975-03-14 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60173580A (en) * | 1984-02-20 | 1985-09-06 | 株式会社アスキ− | Display controller |
Also Published As
Publication number | Publication date |
---|---|
JPS6140997B2 (en) | 1986-09-12 |
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