JPS5725060A - Multicomputer system - Google Patents

Multicomputer system

Info

Publication number
JPS5725060A
JPS5725060A JP9990380A JP9990380A JPS5725060A JP S5725060 A JPS5725060 A JP S5725060A JP 9990380 A JP9990380 A JP 9990380A JP 9990380 A JP9990380 A JP 9990380A JP S5725060 A JPS5725060 A JP S5725060A
Authority
JP
Japan
Prior art keywords
access
memory
available
area
subdivided
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
JP9990380A
Other languages
Japanese (ja)
Inventor
Setsuo Minamide
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9990380A priority Critical patent/JPS5725060A/en
Publication of JPS5725060A publication Critical patent/JPS5725060A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory

Abstract

PURPOSE:To prevent a malfunction and effectively prevent the contents of memory, by subdividing a memory area, deciding by a storage key whether access is available or not, and accessing, in a common memory breakdown preventive system of a multicomputer system. CONSTITUTION:A memory area of a common memory device 1 is subdivided by an optional unit, and corresponding to areas 5-8 which have been subdivided, a storage register 12 of a storage register part 10 is provided by one piece each, in this register 12 is stored the information of computers 2-4 which are capable of accessing its area, and when access has been executed to the related areas 5-8 from each computer 2-4, whether the access is available or not is decided in accordance with a storage key 15, and only when it is available, the access is executed to the common memory device 1. Accordingly, the contents of a memory are not broken down by other computer.
JP9990380A 1980-07-23 1980-07-23 Multicomputer system Pending JPS5725060A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9990380A JPS5725060A (en) 1980-07-23 1980-07-23 Multicomputer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9990380A JPS5725060A (en) 1980-07-23 1980-07-23 Multicomputer system

Publications (1)

Publication Number Publication Date
JPS5725060A true JPS5725060A (en) 1982-02-09

Family

ID=14259727

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9990380A Pending JPS5725060A (en) 1980-07-23 1980-07-23 Multicomputer system

Country Status (1)

Country Link
JP (1) JPS5725060A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS601995A (en) * 1983-06-17 1985-01-08 Hitachi Ltd Control system of microprocessor
US5729717A (en) * 1984-01-31 1998-03-17 Kabushiki Kaisha Toshiba IC card and issuing apparatus allowing multiple applications

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS601995A (en) * 1983-06-17 1985-01-08 Hitachi Ltd Control system of microprocessor
JPH0534877B2 (en) * 1983-06-17 1993-05-25 Hitachi Ltd
US5729717A (en) * 1984-01-31 1998-03-17 Kabushiki Kaisha Toshiba IC card and issuing apparatus allowing multiple applications

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