JPS5482933A - Circuit system altering part of content of character generator - Google Patents

Circuit system altering part of content of character generator

Info

Publication number
JPS5482933A
JPS5482933A JP15107277A JP15107277A JPS5482933A JP S5482933 A JPS5482933 A JP S5482933A JP 15107277 A JP15107277 A JP 15107277A JP 15107277 A JP15107277 A JP 15107277A JP S5482933 A JPS5482933 A JP S5482933A
Authority
JP
Japan
Prior art keywords
character
characters
main
altered
sub
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
JP15107277A
Other languages
Japanese (ja)
Inventor
Masao Matsuda
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15107277A priority Critical patent/JPS5482933A/en
Publication of JPS5482933A publication Critical patent/JPS5482933A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable to change the character in the existing CG, by providing the decoder making effective the sub-CG of specific character pattern memory and the sub-CG at specific address with the main character generator of a plurality of character pattern memory.
CONSTITUTION: The main CG 11 is constituted with the mask ROM in which the character dot pattern is memorized. When the characters of a part of the memory of main CG 11 are altered to other characters, the dot pattern of other characters to be altered is memorized in the sub-CG in PROM constitution. When the character addresses A1 to Ao is a specific value, e.g. all 0, the output of the AND circuit 15 of the decoder 13 is 1, the chip select output CSO is 1, and CSO' is 0, and the main CG 11 is ineffective and the subCG is effective. Next, the row address signal sequentially outputs the line element of altered characters. Thus, without altering the ROM mask of main CG, the characters can be altered.
COPYRIGHT: (C)1979,JPO&Japio
JP15107277A 1977-12-15 1977-12-15 Circuit system altering part of content of character generator Pending JPS5482933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15107277A JPS5482933A (en) 1977-12-15 1977-12-15 Circuit system altering part of content of character generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15107277A JPS5482933A (en) 1977-12-15 1977-12-15 Circuit system altering part of content of character generator

Publications (1)

Publication Number Publication Date
JPS5482933A true JPS5482933A (en) 1979-07-02

Family

ID=15510683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15107277A Pending JPS5482933A (en) 1977-12-15 1977-12-15 Circuit system altering part of content of character generator

Country Status (1)

Country Link
JP (1) JPS5482933A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772192A (en) * 1980-10-23 1982-05-06 Mitsubishi Electric Corp Display unit
JPS60111583A (en) * 1983-10-26 1985-06-18 エヌ・ベー・フイリツプス・フルーイランペンフアブリケン Television receiver
JPS60159784A (en) * 1984-01-31 1985-08-21 キヤノン株式会社 Pattern output unit
JPS60221792A (en) * 1985-03-20 1985-11-06 株式会社日立製作所 Character generation circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772192A (en) * 1980-10-23 1982-05-06 Mitsubishi Electric Corp Display unit
JPS60111583A (en) * 1983-10-26 1985-06-18 エヌ・ベー・フイリツプス・フルーイランペンフアブリケン Television receiver
JPS60159784A (en) * 1984-01-31 1985-08-21 キヤノン株式会社 Pattern output unit
JPH035757B2 (en) * 1984-01-31 1991-01-28 Canon Kk
JPS60221792A (en) * 1985-03-20 1985-11-06 株式会社日立製作所 Character generation circuit

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