JPS5465438A - Memory protecting system - Google Patents
Memory protecting systemInfo
- Publication number
- JPS5465438A JPS5465438A JP13235677A JP13235677A JPS5465438A JP S5465438 A JPS5465438 A JP S5465438A JP 13235677 A JP13235677 A JP 13235677A JP 13235677 A JP13235677 A JP 13235677A JP S5465438 A JPS5465438 A JP S5465438A
- Authority
- JP
- Japan
- Prior art keywords
- information
- memory
- protective
- access
- register
- 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 ensure the memory protection suited for the information possessed by the auxiliary memory unit into which the medium is packed, by memorizing the protecting information of the whole auxiliary memory unit into the specified area of the memory medium and then reading out automatically the information from the specified area of the medium via the command given from the higher- rank memory unit.
CONSTITUTION: Auxilary memory unit 2 contains the memory region comprising plural memory sections storing the protective information which shows the protective state of the predecided memory region plus the memory region composed of plural memory sections which store the access information in the form of a pair against the data information. In addition, file protective register 3 is installed to store the protective information read out from unit 2, along with record protective register 4 which stores the access information. Then the access information of register 4 which was read out by the indication given from higher-rank unti 1 is compared with the protective information of register 3 corresponding to the access information to decide whether the access is possible or not through access deciding circuit 6.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13235677A JPS5465438A (en) | 1977-11-02 | 1977-11-02 | Memory protecting system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13235677A JPS5465438A (en) | 1977-11-02 | 1977-11-02 | Memory protecting system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5465438A true JPS5465438A (en) | 1979-05-26 |
Family
ID=15079438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13235677A Pending JPS5465438A (en) | 1977-11-02 | 1977-11-02 | Memory protecting system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5465438A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63103357A (en) * | 1986-10-21 | 1988-05-09 | Sharp Corp | Desk-top electronic calculator |
-
1977
- 1977-11-02 JP JP13235677A patent/JPS5465438A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63103357A (en) * | 1986-10-21 | 1988-05-09 | Sharp Corp | Desk-top electronic calculator |
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