JPS55166731A - Data protection system - Google Patents
Data protection systemInfo
- Publication number
- JPS55166731A JPS55166731A JP7431679A JP7431679A JPS55166731A JP S55166731 A JPS55166731 A JP S55166731A JP 7431679 A JP7431679 A JP 7431679A JP 7431679 A JP7431679 A JP 7431679A JP S55166731 A JPS55166731 A JP S55166731A
- Authority
- JP
- Japan
- Prior art keywords
- keyboard
- protection system
- data protection
- key
- swl
- 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 protect data up to the current point in an interruption of processing, by adding a change-over switch for locking a keyboard, a display method and a few gates.
CONSTITUTION: With the common terminal of keyboard lock switch SW grounded (SWL is at a low level.), keyboard control logic part invalidates the depression of any key. In this case, since inverter I generates a high-level output, key operation makes transistor TR conduct via AND gate A5, and consequently a light emission diode comes on, showing that the keyboard is being locked.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7431679A JPS55166731A (en) | 1979-06-13 | 1979-06-13 | Data protection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7431679A JPS55166731A (en) | 1979-06-13 | 1979-06-13 | Data protection system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55166731A true JPS55166731A (en) | 1980-12-26 |
Family
ID=13543584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7431679A Pending JPS55166731A (en) | 1979-06-13 | 1979-06-13 | Data protection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55166731A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0143045A2 (en) * | 1983-11-14 | 1985-05-29 | Digital Equipment Corporation | Circuit for selecting and locking of operational function circuitry |
CN102547509A (en) * | 2011-12-15 | 2012-07-04 | 无锡中星微电子有限公司 | Method, apparatus and device for controlling bluetooth headset keyboard |
-
1979
- 1979-06-13 JP JP7431679A patent/JPS55166731A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0143045A2 (en) * | 1983-11-14 | 1985-05-29 | Digital Equipment Corporation | Circuit for selecting and locking of operational function circuitry |
EP0143045A3 (en) * | 1983-11-14 | 1987-08-12 | Digital Equipment Corporation | Circuit for selecting and locking in operation function circuitry |
CN102547509A (en) * | 2011-12-15 | 2012-07-04 | 无锡中星微电子有限公司 | Method, apparatus and device for controlling bluetooth headset keyboard |
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