JPS5534763A - Keyboard input device - Google Patents
Keyboard input deviceInfo
- 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
Links
Landscapes
- 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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5457832A (en) * | 1977-10-17 | 1979-05-10 | Nec Corp | Switch sense system |
-
1978
- 1978-09-05 JP JP10813778A patent/JPS5534763A/en active Pending
Patent Citations (1)
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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