JPS562050A - Electronic desk-top calculator - Google Patents
Electronic desk-top calculatorInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1979
- 1979-06-21 JP JP7758379A patent/JPS562050A/en active Pending
Cited By (3)
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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