JPS54148333A - Memory protection system - Google Patents

Memory protection system

Info

Publication number
JPS54148333A
JPS54148333A JP5650878A JP5650878A JPS54148333A JP S54148333 A JPS54148333 A JP S54148333A JP 5650878 A JP5650878 A JP 5650878A JP 5650878 A JP5650878 A JP 5650878A JP S54148333 A JPS54148333 A JP S54148333A
Authority
JP
Japan
Prior art keywords
memory
power supply
power
information
operator
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
JP5650878A
Other languages
Japanese (ja)
Inventor
Takashi Rokutanda
Tadao Ichikawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5650878A priority Critical patent/JPS54148333A/en
Publication of JPS54148333A publication Critical patent/JPS54148333A/en
Pending legal-status Critical Current

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  • Power Sources (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE: To ensure protection for the contents of the memory by transferring in a high speed the contents of the specified region in the main memory to the auxiliary memory device in case the power supply breaking command is given from the operator or when the unexpected breaking of the AC input occurs.
CONSTITUTION: Main memory 1 memorizing the information is provided along with auxiliary memory device 3 which performs the information transfer with memory 1 plus arithmetic control unit 2 which reads the information out of memory 1 to perfrom the operation and control. In addition, power circuit 4 is installed to supply the power to memory 1 and control unit 2 along with delay circuit 5 which produces the delay time for the time during which the information of the prescribed region in memory 1 is transferred to device 3 via access line 10 when power supply ON/OFF command 11 is given from the operator. The high-speed static memory is used to device 3 to be connected to other power supply such as the battery or the like. Thus, the contents of memory 1 is transferred to devie 3 in a high speed in case the power supply is cut off or the power breaking command is given from the operator.
COPYRIGHT: (C)1979,JPO&Japio
JP5650878A 1978-05-15 1978-05-15 Memory protection system Pending JPS54148333A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5650878A JPS54148333A (en) 1978-05-15 1978-05-15 Memory protection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5650878A JPS54148333A (en) 1978-05-15 1978-05-15 Memory protection system

Publications (1)

Publication Number Publication Date
JPS54148333A true JPS54148333A (en) 1979-11-20

Family

ID=13029058

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5650878A Pending JPS54148333A (en) 1978-05-15 1978-05-15 Memory protection system

Country Status (1)

Country Link
JP (1) JPS54148333A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61210453A (en) * 1985-03-15 1986-09-18 Canon Inc Data memory device
JPH02110643A (en) * 1988-10-19 1990-04-23 Pfu Ltd Attachable and detachable memory card
JPH09133726A (en) * 1995-11-10 1997-05-20 Nec Corp Power cut-off information nitifying device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61210453A (en) * 1985-03-15 1986-09-18 Canon Inc Data memory device
JPH02110643A (en) * 1988-10-19 1990-04-23 Pfu Ltd Attachable and detachable memory card
JPH09133726A (en) * 1995-11-10 1997-05-20 Nec Corp Power cut-off information nitifying device

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