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JPS54139426A - Crt display unit - Google Patents

Crt display unit

Info

Publication number
JPS54139426A
JPS54139426A JP4657078A JP4657078A JPS54139426A JP S54139426 A JPS54139426 A JP S54139426A JP 4657078 A JP4657078 A JP 4657078A JP 4657078 A JP4657078 A JP 4657078A JP S54139426 A JPS54139426 A JP S54139426A
Authority
JP
Japan
Prior art keywords
character
display
characters
timing
memory
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.)
Pending
Application number
JP4657078A
Other languages
Japanese (ja)
Inventor
Kazuo Watanabe
Yasuyo Ishikawa
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
Priority to JP4657078A priority Critical patent/JPS54139426A/en
Publication of JPS54139426A publication Critical patent/JPS54139426A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To ensure a simple switching of the number of the display characters by providing the timing generator circuit to form the dots for the maximum character number in the lateral direction on the CRT screen and using the pulse generating output or its divided output according to the number of the characters to be displayed.
CONSTITUTION: The address information showing the display position plus the character/symbol information are supplied to refresh memory 6 from CPU1 via bus driver 2. The reading of memory 6 for display of characters and symbols onto the CRT screen in carried out sequentially in synchronization with the raster with every character and with the timing pulse corresponding to the character address formed through CRT controller 3 used as the address information. Timing controller 11 forms the character clock, and video clock and the set pulse which are to be the basis of the address timing and the like of memory 6 including the divider and the counter circuit and with the output of oscillator circuit 10 used as the input. The number of the display characters per line can be changed by switching the frequency of the video clock. Thus, the frequency is made double, the number of the display character is increased double per line.
COPYRIGHT: (C)1979,JPO&Japio
JP4657078A 1978-04-21 1978-04-21 Crt display unit Pending JPS54139426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4657078A JPS54139426A (en) 1978-04-21 1978-04-21 Crt display unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4657078A JPS54139426A (en) 1978-04-21 1978-04-21 Crt display unit

Publications (1)

Publication Number Publication Date
JPS54139426A true JPS54139426A (en) 1979-10-29

Family

ID=12750968

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4657078A Pending JPS54139426A (en) 1978-04-21 1978-04-21 Crt display unit

Country Status (1)

Country Link
JP (1) JPS54139426A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5868787A (en) * 1981-10-21 1983-04-23 東芝テック株式会社 Crt display controller
JPS61187094A (en) * 1985-02-14 1986-08-20 松下電器産業株式会社 Electronic type cash register

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS529491A (en) * 1975-07-14 1977-01-25 Yokogawa Hokushin Electric Corp Internal electrode
JPS52125236A (en) * 1976-04-14 1977-10-20 Nec Home Electronics Ltd Letter display system in tv scan character display

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS529491A (en) * 1975-07-14 1977-01-25 Yokogawa Hokushin Electric Corp Internal electrode
JPS52125236A (en) * 1976-04-14 1977-10-20 Nec Home Electronics Ltd Letter display system in tv scan character display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5868787A (en) * 1981-10-21 1983-04-23 東芝テック株式会社 Crt display controller
JPS61187094A (en) * 1985-02-14 1986-08-20 松下電器産業株式会社 Electronic type cash register

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