JPS57101940A - Overrun correction system - Google Patents

Overrun correction system

Info

Publication number
JPS57101940A
JPS57101940A JP17728980A JP17728980A JPS57101940A JP S57101940 A JPS57101940 A JP S57101940A JP 17728980 A JP17728980 A JP 17728980A JP 17728980 A JP17728980 A JP 17728980A JP S57101940 A JPS57101940 A JP S57101940A
Authority
JP
Japan
Prior art keywords
register
contents
transferred
output
carry
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
JP17728980A
Other languages
Japanese (ja)
Other versions
JPS6051132B2 (en
Inventor
Motonori Nagafuji
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP17728980A priority Critical patent/JPS6051132B2/en
Publication of JPS57101940A publication Critical patent/JPS57101940A/en
Publication of JPS6051132B2 publication Critical patent/JPS6051132B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
    • G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
    • G06F7/491—Computations with decimal numbers radix 12 or 20.
    • G06F7/4915—Multiplying; Dividing
    • G06F7/4917—Dividing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

PURPOSE:To execute a decimal division at a remarkably high speed, by providing a delay register for holding a carry out of an operator until the next operation cycle, and returning the contents of a divident register to a value before overrun. CONSTITUTION:A divisor X and a dividend b0 are set to a register 110 and 120, respectively, a substraction is executed, and its difference b1 is derived in a register 150. Also, a carry output showing whether b1 is positive or negative is set to a carry register 155. This set value is delayed and is transferred to a delay register 456. Subsequently, the contents b0 of the register 120 are transferred to an output register 160. Subsequently, the contents b1 of the register 150 are set to the register 120 through a gate 720. As a result of the following substrction, b2=b0-2X is obtained by the register 150. In this case, if b2<0, ''0'' is set to the register 155. After that, in the same way, the subtraction is execute, and b3=b0-3X is derived by the register 150, but an output of the register 456 becomes ''0'', it is inhibited to updata the contents of the register 160, and b1 is transferred to the register 120.
JP17728980A 1980-12-17 1980-12-17 Overrun correction method Expired JPS6051132B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17728980A JPS6051132B2 (en) 1980-12-17 1980-12-17 Overrun correction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17728980A JPS6051132B2 (en) 1980-12-17 1980-12-17 Overrun correction method

Publications (2)

Publication Number Publication Date
JPS57101940A true JPS57101940A (en) 1982-06-24
JPS6051132B2 JPS6051132B2 (en) 1985-11-12

Family

ID=16028412

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17728980A Expired JPS6051132B2 (en) 1980-12-17 1980-12-17 Overrun correction method

Country Status (1)

Country Link
JP (1) JPS6051132B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101640A (en) * 1983-11-07 1985-06-05 Hitachi Ltd decimal division device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101640A (en) * 1983-11-07 1985-06-05 Hitachi Ltd decimal division device

Also Published As

Publication number Publication date
JPS6051132B2 (en) 1985-11-12

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