GB1127352A - Computing machine - Google Patents

Computing machine

Info

Publication number
GB1127352A
GB1127352A GB24221/66A GB2422166A GB1127352A GB 1127352 A GB1127352 A GB 1127352A GB 24221/66 A GB24221/66 A GB 24221/66A GB 2422166 A GB2422166 A GB 2422166A GB 1127352 A GB1127352 A GB 1127352A
Authority
GB
United Kingdom
Prior art keywords
decimal point
digit
register
input
registers
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.)
Expired
Application number
GB24221/66A
Inventor
Gerald Offley Crowther
George Charles Deli
Ramachandra Aragula Rao
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB24221/66A priority Critical patent/GB1127352A/en
Priority to US641846A priority patent/US3575590A/en
Publication of GB1127352A publication Critical patent/GB1127352A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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.
    • G06F7/498—Computations with decimal numbers radix 12 or 20. using counter-type accumulators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
    • G06F3/027—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes for insertion of the decimal point

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • Computational Mathematics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Human Computer Interaction (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Calculators And Similar Devices (AREA)

Abstract

1,127,352. Electronic calculators. MULLARD Ltd. 31 May, 1966, No. 24221/66. Heading G4A. A computing machine has a number of registers each comprising a chain of digit storing cold-cathode decade stepping tube stages, one stage at the end of each chain storing a digit indicating the position of the decimal point in the corresponding stored number. In the embodiment described the machine has an input register and two output registers, the decimal point stage of the former being stepped by a control circuit which supplies a pulse from a cold cathode tube (V5, Fig. 2, not shown) via OR gate (OG4) to the decimal point stage each time a digit key is pressed to insert a number into the input register. When the decimal point position is to be recorded in this register an inhibit signal from a key DP inhibits the V5 pulses while the remaining digits of the number are recorded in the input register. Two further control circuits, Input and Output Control, are also provided to control decimal point positioning during Add, Subtract, Multiply and division operations, these circuits each comprising a ring counter of twelve cold cathode trigger tubes, the particular tube ignited determining the decimal point position of the number in the register at present controlled by the corresponding circuit. During an addition or subtraction between a number in an accumulator register and the input register, the Input and Output counters store the decimal point positions of the two numbers, and operate gates to ensure that the correct digits of the two numbers are added. During a multiplication operation the two decimal point digits of the input and accumulator registers are added by the decimal point control circuit to register a digit position corresponding to the product number, whilst during a division process, the decimal point digit of the dividend is added to the " nines " complement of the decimal point digit of the divisor and " tens " in the sum ignored, whereby the decimal point digit indicates the position of the decimal point in the quotient. The machine also incorporates reset circuits for zeroizing the registers and their corresponding decimal point stages.
GB24221/66A 1966-05-31 1966-05-31 Computing machine Expired GB1127352A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB24221/66A GB1127352A (en) 1966-05-31 1966-05-31 Computing machine
US641846A US3575590A (en) 1966-05-31 1967-05-29 Calculation by counting with decimal-point control apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24221/66A GB1127352A (en) 1966-05-31 1966-05-31 Computing machine

Publications (1)

Publication Number Publication Date
GB1127352A true GB1127352A (en) 1968-09-18

Family

ID=10208294

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24221/66A Expired GB1127352A (en) 1966-05-31 1966-05-31 Computing machine

Country Status (2)

Country Link
US (1) US3575590A (en)
GB (1) GB1127352A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334283A (en) * 1980-06-13 1982-06-08 Motorola Inc Adaptive fixed point arithmetic controller apparatus and method
JPH0664566B2 (en) * 1985-05-16 1994-08-22 キヤノン株式会社 Electronics
US10974266B2 (en) 2016-11-16 2021-04-13 Silgan Dispensing Systems Corporation Atomizer devices, bottles, and methods of using the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920826A (en) * 1955-07-01 1960-01-12 Bell Telephone Labor Inc Computing circuit
US3280315A (en) * 1957-09-06 1966-10-18 Bell Punch Co Ltd Key controlled decimal electronic calculating machine
GB1040477A (en) * 1963-06-26 1966-08-24 Bell Punch Co Ltd Improvements in or relating to electronic circuits employing cold cathode electron tubes
GB1098853A (en) * 1963-11-12 1968-01-10 Mullard Ltd Computing machine
US3358125A (en) * 1964-03-13 1967-12-12 Ind Machine Elettroniche I M E Circuit for displaying the decimal location in electronic type arithmetical computing devices, particularly in connection with digital data readout devices on decimal indicators

Also Published As

Publication number Publication date
US3575590A (en) 1971-04-20

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