JPS5597637A - Interface circuit for character/pattern display unit - Google Patents

Interface circuit for character/pattern display unit

Info

Publication number
JPS5597637A
JPS5597637A JP306179A JP306179A JPS5597637A JP S5597637 A JPS5597637 A JP S5597637A JP 306179 A JP306179 A JP 306179A JP 306179 A JP306179 A JP 306179A JP S5597637 A JPS5597637 A JP S5597637A
Authority
JP
Japan
Prior art keywords
display
data
character
terminal
reset
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
JP306179A
Other languages
Japanese (ja)
Inventor
Shigeru Komatsu
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 JP306179A priority Critical patent/JPS5597637A/en
Publication of JPS5597637A publication Critical patent/JPS5597637A/en
Pending legal-status Critical Current

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  • Digital Computer Display Output (AREA)

Abstract

PURPOSE: To prevent the display of the insignificant patterns by inhibiting the video signals for the reset preparatory period during which the power supply is made and the CPU executes the program.
CONSTITUTION: The data of display RAM8 are read out in sequence based on the addresses produced through synchronous signal/display address generation circuit 6 and then supplied to character generator 9. Then the character code which means the supplied data is converted within generator 9 into the parallel data corresponding to the character pattern, and the parallel data is drawn in when the S/L terminal of shift register 24 in parallel-serial conversion circuit 10 features "L" and then delivered through output terminal 25 for the period of "H" and via the rise of the clock entering the CK terminal. Here, when clear terminal 28 features "L", the output data becomes "L" regardless of the input data. Thus the display can be avoided for the insignificant patterns by inhibiting the video signals for the reset preparatory period during which the reset signal gives the power supply make and then the CPU executes the program.
COPYRIGHT: (C)1980,JPO&Japio
JP306179A 1979-01-17 1979-01-17 Interface circuit for character/pattern display unit Pending JPS5597637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP306179A JPS5597637A (en) 1979-01-17 1979-01-17 Interface circuit for character/pattern display unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP306179A JPS5597637A (en) 1979-01-17 1979-01-17 Interface circuit for character/pattern display unit

Publications (1)

Publication Number Publication Date
JPS5597637A true JPS5597637A (en) 1980-07-25

Family

ID=11546803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP306179A Pending JPS5597637A (en) 1979-01-17 1979-01-17 Interface circuit for character/pattern display unit

Country Status (1)

Country Link
JP (1) JPS5597637A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60216387A (en) * 1984-04-12 1985-10-29 日本電気株式会社 Fluorescent indicator tube display unit
JPS63192828U (en) * 1987-05-29 1988-12-12

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153351A (en) * 1976-06-15 1977-12-20 Sharp Corp Automatic clearing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153351A (en) * 1976-06-15 1977-12-20 Sharp Corp Automatic clearing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60216387A (en) * 1984-04-12 1985-10-29 日本電気株式会社 Fluorescent indicator tube display unit
JPS63192828U (en) * 1987-05-29 1988-12-12

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