GB1356414A - Digitally operating graphic display system - Google Patents

Digitally operating graphic display system

Info

Publication number
GB1356414A
GB1356414A GB4210971A GB4210971A GB1356414A GB 1356414 A GB1356414 A GB 1356414A GB 4210971 A GB4210971 A GB 4210971A GB 4210971 A GB4210971 A GB 4210971A GB 1356414 A GB1356414 A GB 1356414A
Authority
GB
United Kingdom
Prior art keywords
register
line
display system
read
start position
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
GB4210971A
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London 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 Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Priority to GB4210971A priority Critical patent/GB1356414A/en
Priority to DE2244128A priority patent/DE2244128A1/en
Priority to IT69854/72A priority patent/IT974982B/en
Priority to US00288058A priority patent/US3818475A/en
Publication of GB1356414A publication Critical patent/GB1356414A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
    • G09G1/08—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system
    • G09G1/10—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system the deflection signals being produced by essentially digital means, e.g. incrementally
    • 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
    • G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers
    • G06F7/64—Digital differential analysers, i.e. computing devices for differentiation, integration or solving differential or integral equations, using pulses representing increments; Other incremental computing devices for solving difference equations

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Computer Hardware Design (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Image Generation (AREA)
  • Digital Computer Display Output (AREA)
  • Traffic Control Systems (AREA)

Abstract

1356414 Cathode-ray tube displays ELLIOTT BROS (LONDON) Ltd 11 Sept 1972 [9 Sept 1971] 42109/71 Heading H4T In a computer controlled cathode-ray tube display system employing a digital differential analyser technique for displaying lines the incremented DX, DY deflections are produced by respective counter registers X1, Y1 (Fig. 1) which receive the "overflow" from respective accumulator registers Q1, A1 in which incremental quantities derived from the main memory 10 of the computer are inserted under the control of a microprogram control unit 14, the memory 10 also holding the start position co-ordinates XO, YO together with a number indicative of the length of the line to be displayed. By thus employing the computer memory to hold the X and Y deflection incremental quantities and the line length data a saving is made in the number of register required in the display system. In the operation of the system the microprogram control unit 14 operates, as depicted in Fig. 2, to: (1) Clear A1 and Q1; (2) Read the start position co-ordinate XO into register X1; (3) Read the start position co-ordinate Y0 into register Y1; (4) Read the line length count into register T1 and after testing (5) to discover if register T1 has not been counted down to zero (which mould indicate end of line) holds (6) the system until the first point has been displayed. The system then goes through steps (7), (8) and (9) to add the X and Y increments to register Q1 and A1 and to decrement register T1 by one count and continues to repeat the sequence (5) to (9) until the end of the line is indicated by zero count in register T1. Data may be inserted in the memories via register B1. The display system may be used in an aircraft to present flight control and navigation information to the pilot and instead on display straight lines cursive symbols may be drawn by suitable modification of the microprogram.
GB4210971A 1971-09-09 1971-09-09 Digitally operating graphic display system Expired GB1356414A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB4210971A GB1356414A (en) 1971-09-09 1971-09-09 Digitally operating graphic display system
DE2244128A DE2244128A1 (en) 1971-09-09 1972-09-08 SCREEN VIEWER
IT69854/72A IT974982B (en) 1971-09-09 1972-09-08 GRAPHIC DISPLAY SYSTEM ON CATHODIC SCREEN WITH NUMERIC CONTROL
US00288058A US3818475A (en) 1971-09-09 1972-09-11 Digitally operating graphic display system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4210971A GB1356414A (en) 1971-09-09 1971-09-09 Digitally operating graphic display system

Publications (1)

Publication Number Publication Date
GB1356414A true GB1356414A (en) 1974-06-12

Family

ID=10422890

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4210971A Expired GB1356414A (en) 1971-09-09 1971-09-09 Digitally operating graphic display system

Country Status (4)

Country Link
US (1) US3818475A (en)
DE (1) DE2244128A1 (en)
GB (1) GB1356414A (en)
IT (1) IT974982B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179684A (en) * 1974-07-19 1979-12-18 Cheng George C Graphic conversion system for electronic data processing
US3982101A (en) * 1975-05-19 1976-09-21 The United States Of America As Represented By The Secretary Of The Air Force Laser velocimeter real time digital data analyzer
US4205389A (en) * 1976-09-24 1980-05-27 General Electric Company Apparatus for generating a raster image from line segments
US4251816A (en) * 1978-12-21 1981-02-17 Ncr Corporation Method and apparatus for plotting graphics
US4586037A (en) * 1983-03-07 1986-04-29 Tektronix, Inc. Raster display smooth line generation
US4686642A (en) * 1984-10-18 1987-08-11 Etak, Inc. Method and apparatus for generating a stroke on a display
US5835160A (en) 1995-09-13 1998-11-10 Oak Technology, Inc. Sampling rate conversion using digital differential analyzers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1244659A (en) * 1968-07-29 1971-09-02 Nat Res Dev Apparatus for decoding graphic-display information
JPS4810893B1 (en) * 1968-12-11 1973-04-09
US3675208A (en) * 1970-05-28 1972-07-04 Delta Data Syst Editing system for video display terminal
US3725723A (en) * 1970-09-25 1973-04-03 Elliott Bros Graphic display system

Also Published As

Publication number Publication date
US3818475A (en) 1974-06-18
DE2244128A1 (en) 1973-03-15
IT974982B (en) 1974-07-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee