JPS5465438A - Memory protecting system - Google Patents

Memory protecting system

Info

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
Application number
JP13235677A
Other languages
Japanese (ja)
Inventor
Junichi Yamaguchi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13235677A priority Critical patent/JPS5465438A/en
Publication of JPS5465438A publication Critical patent/JPS5465438A/en
Pending legal-status Critical Current

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  • 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
JP13235677A 1977-11-02 1977-11-02 Memory protecting system Pending JPS5465438A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63103357A (en) * 1986-10-21 1988-05-09 Sharp Corp Desk-top electronic calculator

Cited By (1)

* Cited by examiner, † Cited by third party
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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