JPS5457930A - Overflow detection system - Google Patents

Overflow detection system

Info

Publication number
JPS5457930A
JPS5457930A JP12484477A JP12484477A JPS5457930A JP S5457930 A JPS5457930 A JP S5457930A JP 12484477 A JP12484477 A JP 12484477A JP 12484477 A JP12484477 A JP 12484477A JP S5457930 A JPS5457930 A JP S5457930A
Authority
JP
Japan
Prior art keywords
stack level
calculation
key
stack
level
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.)
Granted
Application number
JP12484477A
Other languages
Japanese (ja)
Other versions
JPS6032226B2 (en
Inventor
Tomohiro Shimizu
Yoshinobu Muranaga
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer 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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP52124844A priority Critical patent/JPS6032226B2/en
Publication of JPS5457930A publication Critical patent/JPS5457930A/en
Publication of JPS6032226B2 publication Critical patent/JPS6032226B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Calculators And Similar Devices (AREA)
  • Executing Machine-Instructions (AREA)

Abstract

PURPOSE: To make the operation of calculation easy to understand and facilitate the execution of calculation by detecting the overflow of a stack level, which occurs at a multiplication key omission operation time, in advance.
CONSTITUTION: This system is provided with RAM3 and stack RAM5 to count up the stack level on a basis of the kind of operation key, data is stored in the memory area assigned by this stack level, and it is decided whether the stack level has been over a miximum stack level. That is, when a multiplication key is omitted at a key 29 operation time and an open parenthesis is operated, "1" is set to area YL of RAM3, and the stack level is detected. If the stack level is "4", overflow is displayed; and if the stack level is "3" or less, the stack level is increased by "+1" and is transferred to a register in RAM5 and the next key input is operated. As a result, the operation of calculation can be made easy to understand, and the execution of calculation can be facilitated
COPYRIGHT: (C)1979,JPO&Japio
JP52124844A 1977-10-18 1977-10-18 Overflow detection method Expired JPS6032226B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52124844A JPS6032226B2 (en) 1977-10-18 1977-10-18 Overflow detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52124844A JPS6032226B2 (en) 1977-10-18 1977-10-18 Overflow detection method

Publications (2)

Publication Number Publication Date
JPS5457930A true JPS5457930A (en) 1979-05-10
JPS6032226B2 JPS6032226B2 (en) 1985-07-26

Family

ID=14895485

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52124844A Expired JPS6032226B2 (en) 1977-10-18 1977-10-18 Overflow detection method

Country Status (1)

Country Link
JP (1) JPS6032226B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56127264A (en) * 1980-03-10 1981-10-05 Nec Corp Electronic calculator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56127264A (en) * 1980-03-10 1981-10-05 Nec Corp Electronic calculator

Also Published As

Publication number Publication date
JPS6032226B2 (en) 1985-07-26

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