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JPS5566022A - Color display circuit - Google Patents

Color display circuit

Info

Publication number
JPS5566022A
JPS5566022A JP13927478A JP13927478A JPS5566022A JP S5566022 A JPS5566022 A JP S5566022A JP 13927478 A JP13927478 A JP 13927478A JP 13927478 A JP13927478 A JP 13927478A JP S5566022 A JPS5566022 A JP S5566022A
Authority
JP
Japan
Prior art keywords
ram
capacity
constituted
rams
circuit
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.)
Granted
Application number
JP13927478A
Other languages
Japanese (ja)
Other versions
JPS6133211B2 (en
Inventor
Shigeru Hirahata
Tsuguji Tateuchi
Teruhiro Takezawa
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 JP13927478A priority Critical patent/JPS5566022A/en
Publication of JPS5566022A publication Critical patent/JPS5566022A/en
Publication of JPS6133211B2 publication Critical patent/JPS6133211B2/ja
Granted legal-status Critical Current

Links

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  • Digital Computer Display Output (AREA)

Abstract

PURPOSE: To simplify a circuit constitution and make it possible to realize it cheaply by constituting a large-capacity data RAM from two-system RAMs.
CONSTITUTION: A data RAM is divided into RAM 73A for display and RAM 77A for color and is constituted by a RAM (figyre 50) having a capacity several times as large as the capacity required for the conventional unit. RAM 73A and RAM 77A have 4K bytes respectively, and addresses from (0000)16 to (3FFF)16 and from (4000)16 to (7FFF)16 are constituted there respectively. In this case, timing control circuit 20 determines operations of RAM 73A and RAM 77A by upper two bits of the address signal of CPU1 and outputs respective control signals so that RAM 73A and RAM 77A may be operated while address signals for display are supplied as address signals of RAMs. Thus, a RAM circuit can be constituted only by large-capacity RAMs where a unit price per one bit is cheap.
COPYRIGHT: (C)1980,JPO&Japio
JP13927478A 1978-11-11 1978-11-11 Color display circuit Granted JPS5566022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13927478A JPS5566022A (en) 1978-11-11 1978-11-11 Color display circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13927478A JPS5566022A (en) 1978-11-11 1978-11-11 Color display circuit

Publications (2)

Publication Number Publication Date
JPS5566022A true JPS5566022A (en) 1980-05-19
JPS6133211B2 JPS6133211B2 (en) 1986-08-01

Family

ID=15241458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13927478A Granted JPS5566022A (en) 1978-11-11 1978-11-11 Color display circuit

Country Status (1)

Country Link
JP (1) JPS5566022A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520358A (en) * 1981-05-20 1985-05-28 Mitsubishi Denki Kabushiki Kaisha Optimized display device memory utilization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520358A (en) * 1981-05-20 1985-05-28 Mitsubishi Denki Kabushiki Kaisha Optimized display device memory utilization

Also Published As

Publication number Publication date
JPS6133211B2 (en) 1986-08-01

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