GB1476951A - Electronic calculators - Google Patents

Electronic calculators

Info

Publication number
GB1476951A
GB1476951A GB1889374A GB1889374A GB1476951A GB 1476951 A GB1476951 A GB 1476951A GB 1889374 A GB1889374 A GB 1889374A GB 1889374 A GB1889374 A GB 1889374A GB 1476951 A GB1476951 A GB 1476951A
Authority
GB
United Kingdom
Prior art keywords
clock
micro
instructions
display
time
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
GB1889374A
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of GB1476951A publication Critical patent/GB1476951A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G99/00—Subject matter not provided for in other groups of this subclass
    • G04G99/006—Electronic time-pieces using a microcomputer, e.g. for multi-function clocks
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0064—Visual time or date indication means in which functions not related to time can be displayed
    • G04G9/007—Visual time or date indication means in which functions not related to time can be displayed combined with a calculator or computing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/02—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/02—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators
    • G06F15/0225—User interface arrangements, e.g. keyboard, display; Interfaces to other computer systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/02—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators
    • G06F15/025—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators adapted to a specific application
    • G06F15/0258—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators adapted to a specific application for unit conversion

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Human Computer Interaction (AREA)
  • Mathematical Physics (AREA)
  • Calculators And Similar Devices (AREA)
  • Electric Clocks (AREA)
  • Complex Calculations (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The electric pocket calculator (10) has a keypad (12) with digit and control keys, and a display (14). Its clock operation depends on executing in each case as many instructions in a clock sequence as are necessary to last 0.01 seconds. If the oscillator frequency is 200 kHz, and data is processed bit-serially, the cycle time for a micro-instruction containing 14 numbers coded with 4 BCD digits is 280 mu s. 35 of these micro-instructions take 0.01 s. Dummy micro-instructions are therefore included in the loops for clock operation, corresponding to the difference between 35 and the number of micro-instructions which are necessary to execute the loop. The calculator can be used as a clock or a stopwatch, with display and storage of time intervals. The time of day is set in the display in hh.mmssdd form, and clock operation is started by pressing key (118) followed by (116). CHS is for start-stop operation; EEC scans the hundredths of second part dd in and out; CLX sets the clock to 0; epsilon + stops it. Pressing a digit key stores the intermediate time in the appropriate memory register, to be recalled when clock operation is dormant. <IMAGE>
GB1889374A 1973-05-29 1974-04-30 Electronic calculators Expired GB1476951A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US36457073A 1973-05-29 1973-05-29

Publications (1)

Publication Number Publication Date
GB1476951A true GB1476951A (en) 1977-06-16

Family

ID=23435094

Family Applications (4)

Application Number Title Priority Date Filing Date
GB4614876A Expired GB1476953A (en) 1973-05-29 1974-04-30 Scientific calculator
GB4614976A Expired GB1476954A (en) 1973-05-29 1974-04-30 Scientific calculator
GB1889374A Expired GB1476951A (en) 1973-05-29 1974-04-30 Electronic calculators
GB4614776A Expired GB1476952A (en) 1973-05-29 1974-04-30 Scientific calculator

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB4614876A Expired GB1476953A (en) 1973-05-29 1974-04-30 Scientific calculator
GB4614976A Expired GB1476954A (en) 1973-05-29 1974-04-30 Scientific calculator

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB4614776A Expired GB1476952A (en) 1973-05-29 1974-04-30 Scientific calculator

Country Status (8)

Country Link
JP (1) JPS5653784B2 (en)
AU (1) AU471040B2 (en)
CA (1) CA1028427A (en)
CH (1) CH611762GA3 (en)
DE (2) DE2424756C3 (en)
FR (1) FR2232011B1 (en)
GB (4) GB1476953A (en)
ZA (1) ZA743469B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4503503A (en) * 1980-11-05 1985-03-05 Omron Tateisi Electronic Co. Transaction processing apparatus for storing and/or calculating costs, sales, deductions, number of sales, cost multiplier, and profit, in a departmentalized format

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525565A (en) * 1975-07-02 1977-01-17 Toshiba Corp Electric clock circuit
US4063409A (en) * 1976-01-05 1977-12-20 Intel Corporation Custom watch
US4158285A (en) * 1976-02-09 1979-06-19 Hewlett-Packard Company Interactive wristwatch calculator
JPS6059553B2 (en) * 1976-12-01 1985-12-25 カシオ計算機株式会社 timing device
US4181963A (en) * 1977-04-19 1980-01-01 Casio Computer Co., Ltd. Electronic calculator with time counting function
JPS5451510A (en) * 1977-09-30 1979-04-23 Olympus Optical Co Ltd Tape recorder
DE2812242C2 (en) * 1978-03-21 1987-01-15 Robert Bosch Gmbh, 7000 Stuttgart Process control procedures
DE2951162A1 (en) * 1979-12-19 1981-07-02 Casio Computer Co., Ltd., Tokyo Power consumption control system for digital processor - has clock pulse generator disabled at pre-determined period after last key-in operation using counter circuit detector
JPS57185562A (en) * 1981-05-12 1982-11-15 Casio Comput Co Ltd Small-sized electronic calculator with program
JPS5890262A (en) * 1981-11-25 1983-05-28 Sharp Corp Electronic device
JPS61180182U (en) * 1985-04-27 1986-11-10
JPS6142491U (en) * 1985-07-18 1986-03-19 セイコーエプソン株式会社 Timing device with computer
GB2224866A (en) * 1988-11-02 1990-05-16 Julian David Williams Improvements in or relating to an event recording device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4503503A (en) * 1980-11-05 1985-03-05 Omron Tateisi Electronic Co. Transaction processing apparatus for storing and/or calculating costs, sales, deductions, number of sales, cost multiplier, and profit, in a departmentalized format

Also Published As

Publication number Publication date
DE2424756C3 (en) 1978-06-01
DE2462301C3 (en) 1978-09-28
FR2232011A1 (en) 1974-12-27
DE2424756B2 (en) 1977-10-06
DE2462301A1 (en) 1976-09-16
JPS5653784B2 (en) 1981-12-21
AU6868174A (en) 1975-11-13
CA1028427A (en) 1978-03-21
GB1476952A (en) 1977-06-16
DE2424756A1 (en) 1975-01-09
ZA743469B (en) 1975-06-25
FR2232011B1 (en) 1982-02-19
DE2462301B2 (en) 1978-01-05
CH611762B (en)
AU471040B2 (en) 1976-04-08
GB1476954A (en) 1977-06-16
JPS5047531A (en) 1975-04-28
GB1476953A (en) 1977-06-16
CH611762GA3 (en) 1979-06-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19940429