JPS559220A - Keyboard system - Google Patents

Keyboard system

Info

Publication number
JPS559220A
JPS559220A JP8006378A JP8006378A JPS559220A JP S559220 A JPS559220 A JP S559220A JP 8006378 A JP8006378 A JP 8006378A JP 8006378 A JP8006378 A JP 8006378A JP S559220 A JPS559220 A JP S559220A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
potential
wires
read
output
detected
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
JP8006378A
Inventor
Masaharu Kimura
Kuniaki Makabe
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

Links

Abstract

PURPOSE: To obtain efficient keyboard system, by using the keyboard and the microcomputer.
CONSTITUTION: The microcomputer 2 makes all the output transversal wires to negative potential, sequentially reads in the potential for input longitudinal wires floating in another potential via the resistors Ro to R11 by N wires, and read-in is continued when other potentials are detected, and the read-in is stopped when negative potential is detected and the timer is started. After a given time, the potential for transversal wire group is read in after a given time. When negative potential is detected again, the presence of key is discriminated, the output transversal wires are sequentially into negative potential one by one with the computer 2, the potential of the full input longitudinal wires is sequentially read in by N wires on each occasion and the potential is written RAM. When negative potential is detected on the input longitudinal wires, the depression key is determined from the output transversal wire number and the potential data of the full input longitudinal wires, the code corresponding to each key obtains the depression code from the memory memorized, to perform output on the bus line 3.
COPYRIGHT: (C)1980,JPO&Japio
JP8006378A 1978-06-30 1978-06-30 Keyboard system Pending JPS559220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8006378A JPS559220A (en) 1978-06-30 1978-06-30 Keyboard system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8006378A JPS559220A (en) 1978-06-30 1978-06-30 Keyboard system

Publications (1)

Publication Number Publication Date
JPS559220A true true JPS559220A (en) 1980-01-23

Family

ID=13707766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8006378A Pending JPS559220A (en) 1978-06-30 1978-06-30 Keyboard system

Country Status (1)

Country Link
JP (1) JPS559220A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5771038A (en) * 1980-10-22 1982-05-01 Nec Home Electronics Ltd Key switch scanning system
JPS57174731A (en) * 1981-04-20 1982-10-27 Matsushita Electric Ind Co Ltd Controller of audio device and the like
JPS5885220U (en) * 1981-11-30 1983-06-09
JPS6034250U (en) * 1983-08-13 1985-03-08
JPS643721A (en) * 1987-06-25 1989-01-09 Silver Seiko Key input device
JPS6478316A (en) * 1988-08-20 1989-03-23 Brother Ind Ltd Electronic controller capable of repeating action
JPH02289241A (en) * 1989-02-24 1990-11-29 Abiomed Inc Surgical stapler

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5771038A (en) * 1980-10-22 1982-05-01 Nec Home Electronics Ltd Key switch scanning system
JPS57174731A (en) * 1981-04-20 1982-10-27 Matsushita Electric Ind Co Ltd Controller of audio device and the like
JPS5885220U (en) * 1981-11-30 1983-06-09
JPS6034250U (en) * 1983-08-13 1985-03-08
JPS6211476Y2 (en) * 1983-08-13 1987-03-18
JPS643721A (en) * 1987-06-25 1989-01-09 Silver Seiko Key input device
JPS6478316A (en) * 1988-08-20 1989-03-23 Brother Ind Ltd Electronic controller capable of repeating action
JPH02289241A (en) * 1989-02-24 1990-11-29 Abiomed Inc Surgical stapler

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