JPS56116160A - Electronic desk top calculator - Google Patents

Electronic desk top calculator

Info

Publication number
JPS56116160A
JPS56116160A JP1763280A JP1763280A JPS56116160A JP S56116160 A JPS56116160 A JP S56116160A JP 1763280 A JP1763280 A JP 1763280A JP 1763280 A JP1763280 A JP 1763280A JP S56116160 A JPS56116160 A JP S56116160A
Authority
JP
Japan
Prior art keywords
output
signal line
desk top
state
electronic desk
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
JP1763280A
Other languages
Japanese (ja)
Inventor
Hiroshi Kadota
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 JP1763280A priority Critical patent/JPS56116160A/en
Publication of JPS56116160A publication Critical patent/JPS56116160A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Static Random-Access Memory (AREA)
  • Calculators And Similar Devices (AREA)

Abstract

PURPOSE:To protect a memory content, by making ineffective rewrite of the content of a backup memory in the specific state. CONSTITUTION:At normal operation, the main power supply 2 is fed to the electronic desk top function 1 through the main power supply switch 7 to realize basic function as the electronic desk top calculator. In rewriting the content of the backup memory 5, although the write-in signal is output on the signal line 8, since the output of the state set section 3 is connected to an AND gate 4, the rewrite is enable only when the state of the output 9 is at ''1'', and the value of the signal line 8 is output to the signal line 10. On the other hand, when the state of the output 9 is at ''0'', the gate 4 is closed and the signal on the signal line 8 is not delivered. The memory exclusive power supply 6 is coupled to the backup memory 5.
JP1763280A 1980-02-15 1980-02-15 Electronic desk top calculator Pending JPS56116160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1763280A JPS56116160A (en) 1980-02-15 1980-02-15 Electronic desk top calculator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1763280A JPS56116160A (en) 1980-02-15 1980-02-15 Electronic desk top calculator

Publications (1)

Publication Number Publication Date
JPS56116160A true JPS56116160A (en) 1981-09-11

Family

ID=11949233

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1763280A Pending JPS56116160A (en) 1980-02-15 1980-02-15 Electronic desk top calculator

Country Status (1)

Country Link
JP (1) JPS56116160A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01182995A (en) * 1988-01-18 1989-07-20 Oki Electric Ind Co Ltd Cmos semiconductor integrated circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51831B1 (en) * 1969-07-17 1976-01-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51831B1 (en) * 1969-07-17 1976-01-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01182995A (en) * 1988-01-18 1989-07-20 Oki Electric Ind Co Ltd Cmos semiconductor integrated circuit

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