JPS5494232A - Control system for cathode ray tube display unit - Google Patents

Control system for cathode ray tube display unit

Info

Publication number
JPS5494232A
JPS5494232A JP86978A JP86978A JPS5494232A JP S5494232 A JPS5494232 A JP S5494232A JP 86978 A JP86978 A JP 86978A JP 86978 A JP86978 A JP 86978A JP S5494232 A JPS5494232 A JP S5494232A
Authority
JP
Japan
Prior art keywords
period
input
crt
display
output unit
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
JP86978A
Other languages
Japanese (ja)
Other versions
JPS6053876B2 (en
Inventor
Masatsugu Shinozaki
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 JP86978A priority Critical patent/JPS6053876B2/en
Publication of JPS5494232A publication Critical patent/JPS5494232A/en
Publication of JPS6053876B2 publication Critical patent/JPS6053876B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Image Generation (AREA)
  • Digital Computer Display Output (AREA)

Abstract

PURPOSE:To make easy the access from other input and output unit, by providing the usage condition judging means for CRT refresh memory at the bus control. CONSTITUTION:When the input and output unit such as printer and disc connected via the adaptors 6 and 7 delivers the access request to the CRT refresh memory 3 via the bus 9, the bus control 2 judges whether CRT 5 performs character display or not, and when it is known that the period not performing character display is present, permission signal is given to the input and output unit performing request. The period not performing display is the horizontal and vertical blanking period for CRT scanning, and the display period between characters or picture display entirely inhibited period etc. Those input and output units can directly access the main memory 8 through DMA not via the computer 1.
JP86978A 1978-01-10 1978-01-10 Cathode ray tube display device control method Expired JPS6053876B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP86978A JPS6053876B2 (en) 1978-01-10 1978-01-10 Cathode ray tube display device control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP86978A JPS6053876B2 (en) 1978-01-10 1978-01-10 Cathode ray tube display device control method

Publications (2)

Publication Number Publication Date
JPS5494232A true JPS5494232A (en) 1979-07-25
JPS6053876B2 JPS6053876B2 (en) 1985-11-27

Family

ID=11485668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP86978A Expired JPS6053876B2 (en) 1978-01-10 1978-01-10 Cathode ray tube display device control method

Country Status (1)

Country Link
JP (1) JPS6053876B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116846A (en) * 1982-12-23 1984-07-05 Matsushita Electric Ind Co Ltd Controller of central processing unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116846A (en) * 1982-12-23 1984-07-05 Matsushita Electric Ind Co Ltd Controller of central processing unit

Also Published As

Publication number Publication date
JPS6053876B2 (en) 1985-11-27

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