JPS54139428A - Picture element data generation circuit - Google Patents

Picture element data generation circuit

Info

Publication number
JPS54139428A
JPS54139428A JP4657278A JP4657278A JPS54139428A JP S54139428 A JPS54139428 A JP S54139428A JP 4657278 A JP4657278 A JP 4657278A JP 4657278 A JP4657278 A JP 4657278A JP S54139428 A JPS54139428 A JP S54139428A
Authority
JP
Japan
Prior art keywords
circuit
output
address
raster
character
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
JP4657278A
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 JP4657278A priority Critical patent/JPS54139428A/en
Publication of JPS54139428A publication Critical patent/JPS54139428A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To reduce the number of the bits per character of ROM in the pattern generation circuit by forming the space to secure the line space for the display characters and symbols with the raster address signals.
CONSTITUTION: In case the characters and symbols are displayed at the n-ordered character and the n-ordered line on the display screen, the information written into the corresponding address of refresh memory 2 is read out by the counpter output of CRT control circuit 1 showing the n-ordered line and the n-rodered character plus the output of the character counter. Pattern generation circuits 4 and 5 deliver the picture element data synchronized with the raster via the output of the raster counter formed at circuit 1 for the conversion at P/S circuit 6. Here, the address and space are given in case the bit information of the specified digit of the address counter from circuit 1 is "0" and "1" each. Then the gate circuit provided at the output of circuit 6 is controlled by the raster address output, and thus the picture element data is obtained to form the space part regularly and irrespective of the output of circuit 6.
COPYRIGHT: (C)1979,JPO&Japio
JP4657278A 1978-04-21 1978-04-21 Picture element data generation circuit Pending JPS54139428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4657278A JPS54139428A (en) 1978-04-21 1978-04-21 Picture element data generation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4657278A JPS54139428A (en) 1978-04-21 1978-04-21 Picture element data generation circuit

Publications (1)

Publication Number Publication Date
JPS54139428A true JPS54139428A (en) 1979-10-29

Family

ID=12751021

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4657278A Pending JPS54139428A (en) 1978-04-21 1978-04-21 Picture element data generation circuit

Country Status (1)

Country Link
JP (1) JPS54139428A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5670593A (en) * 1979-11-14 1981-06-12 Tokyo Shibaura Electric Co Display unit
JPS5756889A (en) * 1980-09-24 1982-04-05 Soodo Densanki System Kk Character display controlling method in refresh system indicator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4874745A (en) * 1971-12-30 1973-10-08
JPS5030973A (en) * 1973-07-19 1975-03-27
JPS5127031A (en) * 1974-10-18 1976-03-06 Ricoh Kk MOJIHYO JISOCHI
JPS522223A (en) * 1975-06-24 1977-01-08 Hitachi Ltd Graph illustration system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4874745A (en) * 1971-12-30 1973-10-08
JPS5030973A (en) * 1973-07-19 1975-03-27
JPS5127031A (en) * 1974-10-18 1976-03-06 Ricoh Kk MOJIHYO JISOCHI
JPS522223A (en) * 1975-06-24 1977-01-08 Hitachi Ltd Graph illustration system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5670593A (en) * 1979-11-14 1981-06-12 Tokyo Shibaura Electric Co Display unit
JPS5756889A (en) * 1980-09-24 1982-04-05 Soodo Densanki System Kk Character display controlling method in refresh system indicator

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