JPS562050A - Electronic desk-top calculator - Google Patents

Electronic desk-top calculator

Info

Publication number
JPS562050A
JPS562050A JP7758379A JP7758379A JPS562050A JP S562050 A JPS562050 A JP S562050A JP 7758379 A JP7758379 A JP 7758379A JP 7758379 A JP7758379 A JP 7758379A JP S562050 A JPS562050 A JP S562050A
Authority
JP
Japan
Prior art keywords
ram
data
nonnumeric
depressed
alarm
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
JP7758379A
Other languages
Japanese (ja)
Inventor
Shinichi Nakada
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP7758379A priority Critical patent/JPS562050A/en
Publication of JPS562050A publication Critical patent/JPS562050A/en
Pending legal-status Critical Current

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  • Calculators And Similar Devices (AREA)

Abstract

PURPOSE: To enable an electronic desk-top calculator to send an alarm on detecting malfunction due to RAM by itself by equipping the method of checking the operation of RAM when a nonnumeric key is depressed and the method of giving an alarm when abnormal operation of RAM is detected.
CONSTITUTION: Detecting any of nonnumeric keys being depressed, CPU controls control circuit PCC to send "0" data from ROM to register XR and, after data in RAM are made to stand by in accumulator A, sends the "0" data to an address of RAM assigned by register XR. Next, a difference between the "0" data from RAM and ROM is calculated by arithmetic unit ALU and when the result shows zero, four-bit data of "1111" are stored at the assigned address of RAM. Next, the data of "1111" from RAM are subtracted from those from RAM by unit ALU and when the result shows zero, an instruction equivalent to the depressed nonnumeric key is executed. When the subtraction result of unit ALU is not zero, alarm lamp WL of display unit DSP comes on, warn the malfunction of RAM.
COPYRIGHT: (C)1981,JPO&Japio
JP7758379A 1979-06-21 1979-06-21 Electronic desk-top calculator Pending JPS562050A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7758379A JPS562050A (en) 1979-06-21 1979-06-21 Electronic desk-top calculator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7758379A JPS562050A (en) 1979-06-21 1979-06-21 Electronic desk-top calculator

Publications (1)

Publication Number Publication Date
JPS562050A true JPS562050A (en) 1981-01-10

Family

ID=13637996

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7758379A Pending JPS562050A (en) 1979-06-21 1979-06-21 Electronic desk-top calculator

Country Status (1)

Country Link
JP (1) JPS562050A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04209714A (en) * 1990-12-04 1992-07-31 Akiko:Kk Spherical lump dry ice producing machine
DE102016119215A1 (en) 2015-10-15 2017-04-20 Jtekt Corporation METHOD FOR HEATING A METAL ELEMENT, METHOD FOR BONDING HEATED METAL ELEMENTS AND DEVICE FOR HEATING A METAL ELEMENT
DE102017107627A1 (en) 2016-04-12 2017-10-12 Jtekt Corporation Bonding method and bonding device for a metal element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04209714A (en) * 1990-12-04 1992-07-31 Akiko:Kk Spherical lump dry ice producing machine
DE102016119215A1 (en) 2015-10-15 2017-04-20 Jtekt Corporation METHOD FOR HEATING A METAL ELEMENT, METHOD FOR BONDING HEATED METAL ELEMENTS AND DEVICE FOR HEATING A METAL ELEMENT
DE102017107627A1 (en) 2016-04-12 2017-10-12 Jtekt Corporation Bonding method and bonding device for a metal element

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