GB1332205A - Character generating apparatus - Google Patents

Character generating apparatus

Info

Publication number
GB1332205A
GB1332205A GB1140671*[A GB1140671A GB1332205A GB 1332205 A GB1332205 A GB 1332205A GB 1140671 A GB1140671 A GB 1140671A GB 1332205 A GB1332205 A GB 1332205A
Authority
GB
United Kingdom
Prior art keywords
stroke
character
passed
over
line
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
GB1140671*[A
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 GB1332205A publication Critical patent/GB1332205A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

1332205 Cathode-ray tube displays HEWLETT-PACKARD CO 26 April 1971 [11 May 1970] 11406/71 Heading H4T In an arrangement for tracing characters on a CRT in response to a sequence of digital instructions, each instruction specifies a straight-line vector by its end points (Xa, Ya, Xb, Yb) and in addition includes further digital data specifying the time to be taken over the trace so that the tracing velocity may be kept constant. As shown each character word is loaded in succession into 13 under control of a "ready" signal from 33 (which also over 55 advances the screen X position along the line, or shifts to the next line of characters over 55 and 57), and this addresses the first stroke in a read-only memory 19, thus reading out the X and Y start coordinates to 29, 30. The address in 19 is then incremented and the next X, Y co-ordinates read into 31, 32 (33 continues to order the alternate loading into these pairs of registers). At the same time a Z part of the stroke word is passed to 43, and this contains "length of stroke" data which is decoded and passed to 41 where it produces a ramp voltage of period corresponding to the length of stroke. This ramp voltage controls the speed of switching of the input of D-A converters 21, 27 (comprising current sources and a weighted resistor network) from registers 29, 30 to 31, 32. The outputs of the D-A converters are combined respectively with the character position outputs of 59 and 61, and passed to the CRT. The Z data also controls the unblanking of the tube beam, and provides an end-of-character signal at the last stroke to order the loading of the next character.
GB1140671*[A 1970-05-11 1971-04-26 Character generating apparatus Expired GB1332205A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3605470A 1970-05-11 1970-05-11

Publications (1)

Publication Number Publication Date
GB1332205A true GB1332205A (en) 1973-10-03

Family

ID=21886352

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1140671*[A Expired GB1332205A (en) 1970-05-11 1971-04-26 Character generating apparatus

Country Status (5)

Country Link
US (1) US3660833A (en)
JP (1) JPS559738B1 (en)
DE (1) DE2120283B2 (en)
FR (1) FR2092594A5 (en)
GB (1) GB1332205A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1359674A (en) * 1971-06-11 1974-07-10 Elliott Brothers London Ltd Display system with circle drawing
US3870922A (en) * 1972-05-02 1975-03-11 Nippon Electric Co Graphic pattern generation for a tv-like scanned-graphic display equipment
US3869085A (en) * 1973-12-17 1975-03-04 Sperry Rand Corp Controlled current vector generator for cathode ray tube displays

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090041A (en) * 1959-11-02 1963-05-14 Link Aviation Inc Character generation and display
US3320409A (en) * 1963-01-30 1967-05-16 Burroughs Corp Electronic plotting device
US3329948A (en) * 1963-05-03 1967-07-04 Burroughs Corp Symbol generating apparatus
US3311908A (en) * 1964-10-02 1967-03-28 Burroughs Corp Cathode ray tube display device employing constant velocity beam deflection
US3500332A (en) * 1967-02-10 1970-03-10 Sanders Associates Inc Curve generator for oscillographic display
US3539860A (en) * 1969-04-01 1970-11-10 Adage Inc Vector generator

Also Published As

Publication number Publication date
US3660833A (en) 1972-05-02
JPS559738B1 (en) 1980-03-12
DE2120283A1 (en) 1971-11-18
FR2092594A5 (en) 1972-01-21
DE2120283B2 (en) 1974-11-28

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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