JPS5534763A - Keyboard input device - Google Patents

Keyboard input device

Info

Publication number
JPS5534763A
JPS5534763A JP10813778A JP10813778A JPS5534763A JP S5534763 A JPS5534763 A JP S5534763A JP 10813778 A JP10813778 A JP 10813778A JP 10813778 A JP10813778 A JP 10813778A JP S5534763 A JPS5534763 A JP S5534763A
Authority
JP
Japan
Prior art keywords
data
cpu
contact
keyboard
button
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
JP10813778A
Other languages
Japanese (ja)
Inventor
Tetsuya Ikeda
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10813778A priority Critical patent/JPS5534763A/en
Publication of JPS5534763A publication Critical patent/JPS5534763A/en
Pending legal-status Critical Current

Links

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  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To fetch the input date from the keyboard without setting special interface, by using a key which has two contacts in one button, and connecting one contact and the other contact to the data bus of CPU and the interruption input to CPU, respectively.
CONSTITUTION: Each key-button has two contacts and contactors which contact them, the encoder 12 converts deciaml data to binary data, and the outputs of the buffer circuits 13 and 14 are connected to CPU. As for the address line 6 from CPU, the circuit 13 is selected only when CPU loads the data from the keyboard, and the data are transferred to the data bus line 5. When the key-button is depressed, the signal from one contact converts its decimal data to binary data by the encoder 12, and is transmitted to the line 5 through the circuit 13. The signal from the other contact becomes an interruption input IRQ of CPU through the circuit 14. In this case, even if CPU performs other processing, the interruption is caused, therefore the data from the keyboard can be loaded by halting the aforesaid processing.
COPYRIGHT: (C)1980,JPO&Japio
JP10813778A 1978-09-05 1978-09-05 Keyboard input device Pending JPS5534763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10813778A JPS5534763A (en) 1978-09-05 1978-09-05 Keyboard input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10813778A JPS5534763A (en) 1978-09-05 1978-09-05 Keyboard input device

Publications (1)

Publication Number Publication Date
JPS5534763A true JPS5534763A (en) 1980-03-11

Family

ID=14476864

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10813778A Pending JPS5534763A (en) 1978-09-05 1978-09-05 Keyboard input device

Country Status (1)

Country Link
JP (1) JPS5534763A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457832A (en) * 1977-10-17 1979-05-10 Nec Corp Switch sense system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457832A (en) * 1977-10-17 1979-05-10 Nec Corp Switch sense system

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