JPS5494840A - Information processor - Google Patents

Information processor

Info

Publication number
JPS5494840A
JPS5494840A JP117178A JP117178A JPS5494840A JP S5494840 A JPS5494840 A JP S5494840A JP 117178 A JP117178 A JP 117178A JP 117178 A JP117178 A JP 117178A JP S5494840 A JPS5494840 A JP S5494840A
Authority
JP
Japan
Prior art keywords
gate
register
detector
produced
content
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.)
Granted
Application number
JP117178A
Other languages
Japanese (ja)
Other versions
JPS607819B2 (en
Inventor
Kenji Hayashi
Hiroo Miyadera
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 JP117178A priority Critical patent/JPS607819B2/en
Publication of JPS5494840A publication Critical patent/JPS5494840A/en
Publication of JPS607819B2 publication Critical patent/JPS607819B2/en
Expired legal-status Critical Current

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  • Storage Device Security (AREA)

Abstract

PURPOSE: To protect the low address area on the main memory unit on which important part of the managing program is stored, from the programming mistake of the processor.
CONSTITUTION: When the detector 1 detects that the conventional registers other than number zero are designated at address production, the gate 2 is opened. In this case, when the control signal 5 representing the page register is produced, it is inputted to the gate 3 via the gate 2. When the content of the conventional register is set to the register A, the detector 3 detects whether the 8 to 19-bit of the content of the register A9 is zero or not and opens the gate 4. Accordingly, the error signal is produced from the gate 4. This error signal 6 inhibits the access to memory and the memory protection can be achieved.
COPYRIGHT: (C)1979,JPO&Japio
JP117178A 1978-01-11 1978-01-11 information processing equipment Expired JPS607819B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP117178A JPS607819B2 (en) 1978-01-11 1978-01-11 information processing equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP117178A JPS607819B2 (en) 1978-01-11 1978-01-11 information processing equipment

Publications (2)

Publication Number Publication Date
JPS5494840A true JPS5494840A (en) 1979-07-26
JPS607819B2 JPS607819B2 (en) 1985-02-27

Family

ID=11493977

Family Applications (1)

Application Number Title Priority Date Filing Date
JP117178A Expired JPS607819B2 (en) 1978-01-11 1978-01-11 information processing equipment

Country Status (1)

Country Link
JP (1) JPS607819B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01159748A (en) * 1987-12-16 1989-06-22 Fujitsu Ltd Storage protection system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04261657A (en) * 1991-02-15 1992-09-17 Masaki Takahashi Turning motion apparatus for front arm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01159748A (en) * 1987-12-16 1989-06-22 Fujitsu Ltd Storage protection system

Also Published As

Publication number Publication date
JPS607819B2 (en) 1985-02-27

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