JPS52131434A - Back-up unit for read-only memory - Google Patents

Back-up unit for read-only memory

Info

Publication number
JPS52131434A
JPS52131434A JP4901176A JP4901176A JPS52131434A JP S52131434 A JPS52131434 A JP S52131434A JP 4901176 A JP4901176 A JP 4901176A JP 4901176 A JP4901176 A JP 4901176A JP S52131434 A JPS52131434 A JP S52131434A
Authority
JP
Japan
Prior art keywords
read
memory
unit
buck
economically
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
JP4901176A
Other languages
Japanese (ja)
Inventor
Nagayasu Harada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4901176A priority Critical patent/JPS52131434A/en
Publication of JPS52131434A publication Critical patent/JPS52131434A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
    • G11C17/08—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using semiconductor devices, e.g. bipolar elements

Landscapes

  • Read Only Memory (AREA)
  • For Increasing The Reliability Of Semiconductor Memories (AREA)

Abstract

PURPOSE:To buck up the defective ROM quickly and economically by preparing the simple switching circuit and necessary software.
JP4901176A 1976-04-27 1976-04-27 Back-up unit for read-only memory Pending JPS52131434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4901176A JPS52131434A (en) 1976-04-27 1976-04-27 Back-up unit for read-only memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4901176A JPS52131434A (en) 1976-04-27 1976-04-27 Back-up unit for read-only memory

Publications (1)

Publication Number Publication Date
JPS52131434A true JPS52131434A (en) 1977-11-04

Family

ID=12819197

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4901176A Pending JPS52131434A (en) 1976-04-27 1976-04-27 Back-up unit for read-only memory

Country Status (1)

Country Link
JP (1) JPS52131434A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5634191A (en) * 1979-08-23 1981-04-06 Fujitsu Ltd Associative memory system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5634191A (en) * 1979-08-23 1981-04-06 Fujitsu Ltd Associative memory system
JPS6145318B2 (en) * 1979-08-23 1986-10-07 Fujitsu Ltd

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