US3631457A - Display apparatus - Google Patents

Display apparatus Download PDF

Info

Publication number
US3631457A
US3631457A US855804A US3631457DA US3631457A US 3631457 A US3631457 A US 3631457A US 855804 A US855804 A US 855804A US 3631457D A US3631457D A US 3631457DA US 3631457 A US3631457 A US 3631457A
Authority
US
United States
Prior art keywords
memory
display
character
generating
display apparatus
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 - Lifetime
Application number
US855804A
Inventor
Nagaharu Hamada
Motosi Miyanaka
Yasuo Suzuki
Isao Yasuda
Yukitaka Hayashi
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
Application granted granted Critical
Publication of US3631457A publication Critical patent/US3631457A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/08—Cursor circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/222—Control of the character-code memory

Definitions

  • Patented Dec. 28, 1971 18 Sheets-Sheet 9 bm b 9% mmnvm M Tw 0 hww U u Patented Dec. 28, 1971 3,631,457
  • the present invention proposes a display apparatus in which intensity modulation is applied to scanning lines of a cathoderay tube with suitable timing so as to display a character, symbol or pattern by an assembly of bright spots or dots, that is, by a suitable combination of horizontal and vertical dots.
  • the display section may merely consist of a television receiver of the standard television system, and circulating memories, such as delay line memories or dynamic shift registers, are employed in the control circuit to obtain an inexpensive display apparatus.
  • Another object of the present invention is to provide a display apparatus which can display patterns including a graph in spite of a very small memory capacity.
  • FIG. I is a diagram illustrating the basic principle of the present invention.
  • FIG. 2 is a block diagram showing the basic structure of the present invention.
  • FIG. 3 is a block diagram for the explanation of a basic control circuit and a character-generating circuit in an embodiment of the present invention.
  • FIGS. 4 and 5 show a time chart for the explanation operation of the circuits shown in FIG. 3.
  • FIG. 6a is a block diagram showing the structure of a memory 4 in the embodiment of the present invention.
  • FIG. 6b is a circuit diagram of one of the blocks shown in FIG. 60.
  • FIGS. 7a and 7b are block diagrams respectively showing the structure of a memory control circuit and a cursor control circuit in the embodiment of the present invention.
  • FIGS. 80 and 8! show a time chart for the explanation of the operation of the memory control and cursor control.
  • FIG. 9 is a block diagram showing the structure of a circuit for writing data from a keyboard in the memory in the embodiment of the present invention.
  • FIG. [0 shows a time chart for the explanation of operation of the circuit shown in FIG. 9.
  • FIG. 11 is a diagram illustrating how a pattern and a character are simultaneously displayed by the present invention.
  • FIGS. 12a through 12d illustrate a circuit diagram of another embodiment of the present invention for effecting a display as shown in FIG. 11.
  • FIG. 13 is a view showing the relation between FIGS. 12a, 12b, 12c and IZd.
  • FIG. 14 is a block diagram showing a practical example comprising a combination of a display apparatus and a television receiver.
  • FIG. I5 shows a time chart for the explanation of write-in operation with a high-speed shift register.
  • FIG. 1 is a diagram illustrating the basic principle of the present invention.
  • FIG. Ia shows diagrammatically a part of the display on the screen of a cathode-ray tube.
  • intensity modulation is applied to the rasters with suitable timing so as to display a character, symbol or pattern by an assembly of bright spots or dots.
  • the video signal corresponding to the respective raster may be controlled in a manner as seen in FIG. lb so that they can display a specific character or symbol.
  • I4 rasters are allotted to one line of a character or symbol to be displayed, with 7 rasters being used for display and the remaining rasters are used to provide a space between lines, while in the horizontal direction, eight dots are allotted, with five dots used for display and the remaining dots used to provide a space between characters or symbols.
  • any desired character or symbol can be displayed by the combination of 35 dots consisting of five horizontal dots and seven vertical dots.
  • the display apparatus comprises a keyboard and printer unit I, a memory control circuit 2, a data processing unit 3 such as a computer or data logger, a memory 4, a basic control circuit 5, a charactergenerating circuit 6 and a display unit 7.
  • the keyboard and printer unit I writes in desired characters or symbols and prints displayed characters or symbols for preservation.
  • the memory control circuit 2 controls the acceptance and delivery of data between the keyboard and printer unit I, the computer 3 and the memory 4 and readout of data from the memory 4 for delivery to the character-generating circuit 6 for the sake of display.
  • the memory 4 stores the code of the characters to be displayed on the screen and effects readout and write-in of data under the control of the memory control circuit 2.
  • the basic control circuit 5 produces the horizontal and vertical synchronizing signals to be applied to the display unit 7, and at the same time, applies signals designating the position of the characters, space between characters and space between lines to the character-generating circuit 6 and memory control circuit 2.
  • the character-generating circuit 6 generates a video signal according to the timing designated by the basic control circuit 5 on the basis of the code supplied from the memory 4 and delivers the video signal to the display unit 7.
  • the display unit 7 displays a character or symbol on the face of a cathode ray tube when it receives the video signal described above and the synchronizing signals supplied from the basic control circuit 5.
  • a display apparatus having a plurality of input units

Abstract

A display apparatus having a keyboard for encoding elements for the display of various characters, symbols or graphs by the combination of dots on a cathode ray tube operated in accordance with the standard television system, and MOS (Metal Oxide Semiconductor) dynamic shift registers for storing the codes representing the characters, symbols on graphs to be displayed. A video signal according to the codes applies intensity modulation to the scanning lines or rasters thereby to effect the desired display on the cathode ray tube. Renewal of displayed character can be effected by displaying a cursor at a renewed position on the cathode ray tube and manipulating the keyboard.

Description

United States Patent Primary Examiner-John W. Caldwell Assistant Examiner David L. Trafton Attorney-Craig, Antonelli & Hill ABSTRACT: A display apparatus having a keyboard for encoding elements for the display of various characters, symbols or graphs by the combination of dots on a cathode ray tube operated in accordance with the standard television system, and MOS (Metal Oxide Semiconductor) dynamic shift registers for storing the codes representing the characters, symbols on graphs to be displayed. A video signal according to the codes applies intensity modulation to the scanning lines or tasters thereby to effect the desired display on the cathode ray tube. Renewal of displayed character can be effected by displaying a cursor at a renewed position on the cathode ray tube and manipulating the keyboard.
lnventors Nagaharu Hamada Hitachi-chi; Mot/oat Mlyanaltn, Kumagegun, Ynmaguehl-ken; YIIIIO Suzuki; hao Yasuda; Yukltaka Bayaahl, all of Hitachi shl, all of Japan Appl. No. 855,804 Filed Sept. 8, 1969 Patented Dec. 28, 1971 Assignee Hltaehl, Ltd.
Tokyo, Japan Priorities Sept. 9, 1968 Japan 43/6426 1; Jan. 30, 1969, Japan, No. 44/7110; Jan. 30, 1969, Japan, No. 44/8499 DISPLAY APPARATUS 5 Claims, 21 Drawing Figs.
15. Cl. 340/324 A, 340/ 1 72.5 Int. Cl G06! 3/14 Field of Search 340/324 A, 220
3 4 J 1 04 7A H'i'OCESSM/G my IG'YBOGRD mm AND HUM/7Z7? GOVT/POL W727? GEM/M701? DISPLAY BASIC CONTROL Patented Dec. 28, 1971 CHARACTFRSH ICE (Pf/7 )C/MMCTEP 18 Sheets-Sheet 1 CHARAcER SPACE r [-m L/NE 7 *L/NESPACE LWESPACE' INVENTORS BY 11?,W Jilwadvmu ATTORNEYS Patented Dec. 28, 1971 3,631 ,457
18 Sheets-Sheet 8 3 4 6 7 J J S 2 DATA PROCESS/N6 CHARACTER MEMORY a-RAr0R DIS/OLA Y 5 r J 2 S KEYBOARD MEMORY BASIC AND HP/NTER CUNTROL CONTROL ONE ICl-MRACIFR CURSOR A r SHIFT PULSE I l SH/Fr PLL$I INVENTORS nmblhnm dl'ldacb moTaS mama usu sucuKi sap Y udul BY fiuKcRKa. Hu
6% 0 19? I, I w ATTORNEY;
18 Sheets-Sheet 6 FIG. 60
INVENTORL D him "0 OSI m usuo Suz K] BY Y0 Rd W 5h.
Patented Dec. 28, 1971 18 Sheets-Sheet 9 bm b 9% mmnvm M Tw 0 hww U u Patented Dec. 28, 1971 3,631,457
18 Sheets-Sheet 1 l 40 cmmcrzns 5 CHARACTERS 5 CHARACTERS lHl lllll lllllllllllilllIIIIIIIHIIHI llIlHl DISPLAY WR/I'E m/ MEMORY46 IN VENTORS BY YUKfr-sk' 1311 Mu M Q ATTORNEYS Patented Dec. 28, 1971 3,631,457
18 Sheets-Sheet 15 INVENTOI6 Patented Dec. 28, 1971 3,631,457
18 Sheets-Sheet 14.
HOP/ZONTAL COUNTER COUNTER HOQ/ZONZ IL l4 POS/T/O/V HORIZONTAL DOT ADDRESS 056005? n ml N V E N TO RS 3%) fr; :I K i 3500 Su 33s vi il BY 6% H1 mum ATTOR NI'LYS Patented Dec. 28, 1971 18 Sheets-Sheet 1 B NQQQQMQ WMMQQQ? Patented Dec. 28, 1971 18 Sheets-Sheet 16 VERT/CAL SYNCS/GML FIG I20 COUNTER VERTICAL ROS/T/ON COUNTER VERT/CAL OUT yi soo 5mm? mg dd, YUKI INVENTOI6 *Nda.
si "M tsu ATTORNEYS Patented Dec. 28, 1971 18 Sheets-Sheet 17 S L l 2 mumm w w mwwmaw hmm 0 olsPLAv APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a display apparatus.
2. Description of the Prior Art A remarkable increase in the amount of information handled by electronic computers is seen as the size of electronic computers becomes larger, and therefore it is desired to simplify the means available for man-machine communication.
Various types of character display apparatus, pattern display apparatus and the like have been developed and some of them have been disclosed, for example, in the Japanese in ine "Fuji" Vol. 12, No. 4 and the Japanese magazine OI-1M Feb. I968.
However, the known apparatus of this kind are relatively costly and involve economical problems. Thus, it is the present practice that the apparatus of this kind is not so popularly used as to match the increase in the amount of information in spite of the emphasis placed on the necessity for such apparatus. These problems mainly arise from the fact that the apparatus employ a special cathode-ray tube in the display section which includes a complex control circuit. Therefore, the appearance of an economical display apparatus employing a cathode-ray tube commonly used in commercial television sets and an inexpensive control circuit are strongly required.
SUMMARY OF THE INVENTION The present invention proposes a display apparatus in which intensity modulation is applied to scanning lines of a cathoderay tube with suitable timing so as to display a character, symbol or pattern by an assembly of bright spots or dots, that is, by a suitable combination of horizontal and vertical dots. According to the present invention, the display section may merely consist of a television receiver of the standard television system, and circulating memories, such as delay line memories or dynamic shift registers, are employed in the control circuit to obtain an inexpensive display apparatus.
It is a primary object of the present invention to provide an inexpensive and highly reliable display apparatus.
Another object of the present invention is to provide a display apparatus which can display patterns including a graph in spite of a very small memory capacity.
Other objects, features and advantages of the present invention will be apparent from the following detailed description taken in conjunction wifli the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a diagram illustrating the basic principle of the present invention.
FIG. 2 is a block diagram showing the basic structure of the present invention.
FIG. 3 is a block diagram for the explanation of a basic control circuit and a character-generating circuit in an embodiment of the present invention.
FIGS. 4 and 5 show a time chart for the explanation operation of the circuits shown in FIG. 3.
FIG. 6a is a block diagram showing the structure of a memory 4 in the embodiment of the present invention.
FIG. 6b is a circuit diagram of one of the blocks shown in FIG. 60.
FIGS. 7a and 7b are block diagrams respectively showing the structure of a memory control circuit and a cursor control circuit in the embodiment of the present invention.
FIGS. 80 and 8!: show a time chart for the explanation of the operation of the memory control and cursor control.
, FIG. 9 is a block diagram showing the structure of a circuit for writing data from a keyboard in the memory in the embodiment of the present invention.
FIG. [0 shows a time chart for the explanation of operation of the circuit shown in FIG. 9.
FIG. 11 is a diagram illustrating how a pattern and a character are simultaneously displayed by the present invention.
FIGS. 12a through 12d illustrate a circuit diagram of another embodiment of the present invention for effecting a display as shown in FIG. 11.
FIG. 13 is a view showing the relation between FIGS. 12a, 12b, 12c and IZd.
FIG. 14 is a block diagram showing a practical example comprising a combination of a display apparatus and a television receiver.
FIG. I5 shows a time chart for the explanation of write-in operation with a high-speed shift register.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with regard to an example in which a television receiver of the standard television system (horizontal synchronizing frequency of 15.75 kHz. and vertical synchronizing frequency of 60 Hz. com monly used in Japan and the United States is utilized in the display section of the display apparatus according to the present invention.
FIG. 1 is a diagram illustrating the basic principle of the present invention. FIG. Ia shows diagrammatically a part of the display on the screen of a cathode-ray tube. In FIG. la, y,, y,,-,ay y,, y,,-represent the scanning lines running across the face of a cathode-ray tube in the horizontal direction (Ilyback lines are not shown herein), while 1,, x r x x,, represent the timing for applying intensity modulation to the scanning lines. It will be seen from FIG. Ia that, in accordance with the present invention, intensity modulation is applied to the rasters with suitable timing so as to display a character, symbol or pattern by an assembly of bright spots or dots. Thus, special deflection circuits are not required for the display and a television receiver of the standard television system can be utilized. In accordance with the present invention, the video signal corresponding to the respective raster may be controlled in a manner as seen in FIG. lb so that they can display a specific character or symbol. In the case of FIG. I, I4 rasters are allotted to one line of a character or symbol to be displayed, with 7 rasters being used for display and the remaining rasters are used to provide a space between lines, while in the horizontal direction, eight dots are allotted, with five dots used for display and the remaining dots used to provide a space between characters or symbols. According to this example, therefore, any desired character or symbol can be displayed by the combination of 35 dots consisting of five horizontal dots and seven vertical dots.
Referring to FIG. 2 which is a block diagram showing the basic structure of the present invention, the display apparatus comprises a keyboard and printer unit I, a memory control circuit 2, a data processing unit 3 such as a computer or data logger, a memory 4, a basic control circuit 5, a charactergenerating circuit 6 and a display unit 7. The keyboard and printer unit I writes in desired characters or symbols and prints displayed characters or symbols for preservation. The memory control circuit 2 controls the acceptance and delivery of data between the keyboard and printer unit I, the computer 3 and the memory 4 and readout of data from the memory 4 for delivery to the character-generating circuit 6 for the sake of display. The memory 4 stores the code of the characters to be displayed on the screen and effects readout and write-in of data under the control of the memory control circuit 2. The basic control circuit 5 produces the horizontal and vertical synchronizing signals to be applied to the display unit 7, and at the same time, applies signals designating the position of the characters, space between characters and space between lines to the character-generating circuit 6 and memory control circuit 2. The character-generating circuit 6 generates a video signal according to the timing designated by the basic control circuit 5 on the basis of the code supplied from the memory 4 and delivers the video signal to the display unit 7. The display unit 7 displays a character or symbol on the face of a cathode ray tube when it receives the video signal described above and the synchronizing signals supplied from the basic control circuit 5. A display apparatus having a plurality of input units

Claims (5)

1. A display apparatus comprising means for supplying information-representing characters to be displayed, memory means for storing said information to be displayed, memory control means for controlling the storage and rewrite of the information in said memory means, character-generating means for generating signals representing chAracters corresponding to the contents of said memory means, cathode-ray tube display means for displaying a character depending on the output from said charactergenerating means, said display means being provided with a deflection system and a deflection control system corresponding to that of the standard commercial television receiver, and a basic control circuit having an oscillator generating a specific frequency for applying control signals to said memory control means and character-generating means with a predetermined timing, said memory means comprising a number of component memory means equal to the number of bits forming characters to be displayed, said components memory means being connected in parallel and each component memory means comprising first and second circulating memories connected in cascade, said first circulating memory containing information for one horizontal sweep in a line of the display, said second circulating memory containing information for the remaining lines of the display, the output of said first circulating memory being connected to said character-generating means in control thereof, said memory control means including means for separately controlling said first and second circulating memories.
2. A display apparatus as claimed in claim 1, in which said second circulating memory is divided into a plurality of blocks which are controlled by separate pulse trains.
3. A display apparatus as claimed in claim 1, in which there is provided at least one pattern-generating circuit for generating preselected pattern elements and means for switching connections between said character generating circuit and said pattern generating circuit.
4. A display apparatus as claimed in claim 1, in which there are provided further memory means for preselected pattern elements, which are interconnected with the remaining means in the apparatus so as to allow a parallel operation with the first-mentioned memory means for the information of characters.
5. A display apparatus as claimed in claim 1, further including means for controlling and detecting the position of a cursor which means includes means for producing an output at a time earlier by predetermined bit time than the time when the cursor actually appears, and means responsive to said output for writing an external signal into said memory means at the address corresponding to the position of said cursor.
US855804A 1968-09-09 1969-09-08 Display apparatus Expired - Lifetime US3631457A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP43064261A JPS497615B1 (en) 1968-09-09 1968-09-09

Publications (1)

Publication Number Publication Date
US3631457A true US3631457A (en) 1971-12-28

Family

ID=13253058

Family Applications (1)

Application Number Title Priority Date Filing Date
US855804A Expired - Lifetime US3631457A (en) 1968-09-09 1969-09-08 Display apparatus

Country Status (2)

Country Link
US (1) US3631457A (en)
JP (1) JPS497615B1 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746793A (en) * 1972-08-09 1973-07-17 Phonics Corp Telephone communication system for the hearing impaired
US3750135A (en) * 1971-10-15 1973-07-31 Lektromedia Ltd Low resolution graphics for crt displays
US3793483A (en) * 1972-11-24 1974-02-19 N Bushnell Video image positioning control system for amusement device
US3792613A (en) * 1972-05-19 1974-02-19 Krautkramer Branson Pulse-echo ultrasonic test apparatus with cathode ray tube digital display
US3798366A (en) * 1972-03-06 1974-03-19 R Winkler Infrared imaging system
US3872461A (en) * 1972-10-26 1975-03-18 Mennen Greatbatch Electronics Waveform and symbol display system
US3906480A (en) * 1973-02-23 1975-09-16 Ibm Digital television display system employing coded vector graphics
US3958225A (en) * 1974-01-28 1976-05-18 Teletype Corporation Apparatus and method for controlling a communications terminal
US4015846A (en) * 1976-04-30 1977-04-05 Robert Ralph Runte Handicapping circuit for electronic games
JPS5315937A (en) * 1976-07-28 1978-02-14 Kawai Musical Instr Mfg Co Game apparatus by pictureetube display
US4139903A (en) * 1976-03-31 1979-02-13 Hewlett-Packard Company Logic state analyzer
US4155095A (en) * 1976-09-16 1979-05-15 Alpex Computer Corporation Chroma control for television control apparatus
US4202041A (en) * 1977-07-11 1980-05-06 Massachusetts Institute Of Technology Dynamically variable keyboard terminal
US4475172A (en) * 1978-05-30 1984-10-02 Bally Manufacturing Corporation Audio/visual home computer and game apparatus
US5125671A (en) * 1982-12-22 1992-06-30 Ricoh Co., Ltd. T.V. game system having reduced memory needs

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552331A (en) * 1947-09-08 1951-05-08 Anthony H Lamb Electric clock fire alarm
US3336587A (en) * 1964-11-02 1967-08-15 Ibm Display system with intensification
US3345458A (en) * 1963-10-16 1967-10-03 Rca Corp Digital storage and generation of video signals
US3382487A (en) * 1965-12-27 1968-05-07 Xerox Corp Dataphone driven remote display system
US3388391A (en) * 1965-04-07 1968-06-11 Rca Corp Digital storage and generation of video signals
US3396377A (en) * 1964-06-29 1968-08-06 Gen Electric Display data processor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552331A (en) * 1947-09-08 1951-05-08 Anthony H Lamb Electric clock fire alarm
US3345458A (en) * 1963-10-16 1967-10-03 Rca Corp Digital storage and generation of video signals
US3396377A (en) * 1964-06-29 1968-08-06 Gen Electric Display data processor
US3336587A (en) * 1964-11-02 1967-08-15 Ibm Display system with intensification
US3388391A (en) * 1965-04-07 1968-06-11 Rca Corp Digital storage and generation of video signals
US3382487A (en) * 1965-12-27 1968-05-07 Xerox Corp Dataphone driven remote display system

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750135A (en) * 1971-10-15 1973-07-31 Lektromedia Ltd Low resolution graphics for crt displays
US3798366A (en) * 1972-03-06 1974-03-19 R Winkler Infrared imaging system
US3792613A (en) * 1972-05-19 1974-02-19 Krautkramer Branson Pulse-echo ultrasonic test apparatus with cathode ray tube digital display
US3746793A (en) * 1972-08-09 1973-07-17 Phonics Corp Telephone communication system for the hearing impaired
US3872461A (en) * 1972-10-26 1975-03-18 Mennen Greatbatch Electronics Waveform and symbol display system
US3793483A (en) * 1972-11-24 1974-02-19 N Bushnell Video image positioning control system for amusement device
US3906480A (en) * 1973-02-23 1975-09-16 Ibm Digital television display system employing coded vector graphics
US3958225A (en) * 1974-01-28 1976-05-18 Teletype Corporation Apparatus and method for controlling a communications terminal
US4139903A (en) * 1976-03-31 1979-02-13 Hewlett-Packard Company Logic state analyzer
US4015846A (en) * 1976-04-30 1977-04-05 Robert Ralph Runte Handicapping circuit for electronic games
JPS5315937A (en) * 1976-07-28 1978-02-14 Kawai Musical Instr Mfg Co Game apparatus by pictureetube display
JPS5437544B2 (en) * 1976-07-28 1979-11-15
US4155095A (en) * 1976-09-16 1979-05-15 Alpex Computer Corporation Chroma control for television control apparatus
US4202041A (en) * 1977-07-11 1980-05-06 Massachusetts Institute Of Technology Dynamically variable keyboard terminal
US4475172A (en) * 1978-05-30 1984-10-02 Bally Manufacturing Corporation Audio/visual home computer and game apparatus
US5125671A (en) * 1982-12-22 1992-06-30 Ricoh Co., Ltd. T.V. game system having reduced memory needs
US5308086A (en) * 1982-12-22 1994-05-03 Ricoh Co., Ltd. Video game external memory arrangement with reduced memory requirements
US5560614A (en) * 1982-12-22 1996-10-01 Ricoh Co., Ltd. Video game system having reduced memory needs for a raster scanned display

Also Published As

Publication number Publication date
JPS497615B1 (en) 1974-02-21

Similar Documents

Publication Publication Date Title
US3631457A (en) Display apparatus
US3413610A (en) Display device with synchronized video and bcd data in a cyclical storage
EP0023217B1 (en) Data processing system for color graphics display
US3936664A (en) Method and apparatus for generating character patterns
EP0145529B1 (en) Split screen smooth scrolling arrangement
US4075620A (en) Video display system
US4203107A (en) Microcomputer terminal system having a list mode operation for the video refresh circuit
US4486856A (en) Cache memory and control circuit
US3675232A (en) Video generator for data display
JPS6336786B2 (en)
US4570161A (en) Raster scan digital display system
US3742482A (en) Method and apparatus for generating a traveling display
US4468662A (en) Display apparatus for displaying characters or graphics on a cathode ray tube
CA1085510A (en) Compressed refresh buffer
GB1263281A (en) Improvements relating to character display arrangements
US4093996A (en) Cursor for an on-the-fly digital television display having an intermediate buffer and a refresh buffer
US4011556A (en) Graphic display device
US4309700A (en) Cathode ray tube controller
US4516266A (en) Entity control for raster displays
US4228510A (en) Character generator
US3729730A (en) Display system
US4613856A (en) Character and video mode control circuit
US3883728A (en) Digital vector generator
US3787833A (en) Upshift control for video display
GB1130635A (en) Improvement relating to electronic display systems