JPS5512567A - Memory protection circuit - Google Patents
Memory protection circuitInfo
- Publication number
- JPS5512567A JPS5512567A JP8513778A JP8513778A JPS5512567A JP S5512567 A JPS5512567 A JP S5512567A JP 8513778 A JP8513778 A JP 8513778A JP 8513778 A JP8513778 A JP 8513778A JP S5512567 A JPS5512567 A JP S5512567A
- Authority
- JP
- Japan
- Prior art keywords
- read
- memories
- computer
- state
- protection circuit
- 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
- Storage Device Security (AREA)
Abstract
PURPOSE: To prevent the malfunction of memory efficiently, by making the memory into read state with the manual switch and the automatic switch which is controlled with the computer.
CONSTITUTION: The circuit provides the manual selection switches 11 to 13 which can compulsively make the memories 2 to 4 into read state without being affected with the state of the read/write signal from the computer 1, and the automatic selection switches 18 to 20 which can compulsively make the memories 2 to 4 into read with the signal from the computer 1. Further, when at least one of the switches 11 to 13 and 18 to 20 is in read state, connection is made so that the memories 2 to 4 are in read state.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8513778A JPS5512567A (en) | 1978-07-14 | 1978-07-14 | Memory protection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8513778A JPS5512567A (en) | 1978-07-14 | 1978-07-14 | Memory protection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5512567A true JPS5512567A (en) | 1980-01-29 |
Family
ID=13850256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8513778A Pending JPS5512567A (en) | 1978-07-14 | 1978-07-14 | Memory protection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5512567A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63140495A (en) * | 1986-12-03 | 1988-06-13 | Nec Corp | Write inhibition circuit |
JPH01155545U (en) * | 1988-04-19 | 1989-10-25 |
-
1978
- 1978-07-14 JP JP8513778A patent/JPS5512567A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63140495A (en) * | 1986-12-03 | 1988-06-13 | Nec Corp | Write inhibition circuit |
JPH01155545U (en) * | 1988-04-19 | 1989-10-25 |
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