JPS5617430A - Malfunction prevention system of light-pen detecting circuit - Google Patents

Malfunction prevention system of light-pen detecting circuit

Info

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
Application number
JP9229379A
Other languages
Japanese (ja)
Inventor
Kenji Kono
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9229379A priority Critical patent/JPS5617430A/en
Publication of JPS5617430A publication Critical patent/JPS5617430A/en
Pending legal-status Critical Current

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
JP9229379A 1979-07-20 1979-07-20 Malfunction prevention system of light-pen detecting circuit Pending JPS5617430A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62251823A (en) * 1986-04-23 1987-11-02 Nec Corp Light pen control device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50158224A (en) * 1974-05-24 1975-12-22

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50158224A (en) * 1974-05-24 1975-12-22

Cited By (1)

* Cited by examiner, † Cited by third party
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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