JPS5617430A - Malfunction prevention system of light-pen detecting circuit - Google Patents
Malfunction prevention system of light-pen detecting circuitInfo
- Publication number
- JPS5617430A JPS5617430A JP9229379A JP9229379A JPS5617430A JP S5617430 A JPS5617430 A JP S5617430A JP 9229379 A JP9229379 A JP 9229379A JP 9229379 A JP9229379 A JP 9229379A JP S5617430 A JPS5617430 A JP S5617430A
- Authority
- JP
- Japan
- Prior art keywords
- detected
- scan
- information
- light
- bit
- 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 prevent malfunction by regarding as a normal detection signal a signal when the same position is detected twice continuously.
CONSTITUTION: Information detected by a light pen is converted into 8-bit data showing its attribute, which are stored in a refresh memory. The 7th bit of the data is set to "1" when information obtained by the 1st scan on a display screen is detected. In the 2nd following scan, only fields where the 7th bit has been set to "1" in the 1st scan are considered to be detection objects and only when information is detected in the 2nd scan as well, the detected information is sent to a central processor.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9229379A JPS5617430A (en) | 1979-07-20 | 1979-07-20 | Malfunction prevention system of light-pen detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9229379A JPS5617430A (en) | 1979-07-20 | 1979-07-20 | Malfunction prevention system of light-pen detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5617430A true JPS5617430A (en) | 1981-02-19 |
Family
ID=14050362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9229379A Pending JPS5617430A (en) | 1979-07-20 | 1979-07-20 | Malfunction prevention system of light-pen detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5617430A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62251823A (en) * | 1986-04-23 | 1987-11-02 | Nec Corp | Light pen control device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50158224A (en) * | 1974-05-24 | 1975-12-22 |
-
1979
- 1979-07-20 JP JP9229379A patent/JPS5617430A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50158224A (en) * | 1974-05-24 | 1975-12-22 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62251823A (en) * | 1986-04-23 | 1987-11-02 | Nec Corp | Light pen control device |
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