JPS55138144A - Data write system of crt display unit - Google Patents
Data write system of crt display unitInfo
- Publication number
- JPS55138144A JPS55138144A JP4557279A JP4557279A JPS55138144A JP S55138144 A JPS55138144 A JP S55138144A JP 4557279 A JP4557279 A JP 4557279A JP 4557279 A JP4557279 A JP 4557279A JP S55138144 A JPS55138144 A JP S55138144A
- Authority
- JP
- Japan
- Prior art keywords
- write
- las
- selector
- address
- counter
- 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
Links
Abstract
PURPOSE: To prevent the generation of noises by simplifying circuit constitution while increasing a write speed by sending a write signal to a memory stroed with data of characters to be displayed in rasters while a beam scans a cursor blank part.
CONSTITUTION: Dot clock pulse DCP is applied to free-running address counter SAC and the output of line counter C4 is applied to line address selector LAS, which is further applied with write line address WLA. Then, outputs FCC0WFCC5 of column counter C2 are applied to coincidence circuit CIC, which is also applied with write solumn address WCA at the other input, and the output of selector LAS and circuit CIC and AND-ed by AND gate G2. Screen memory SCM is stored with data corresponding to characters in a block and while a beam scans a cursor blank part, write signal MWR is supplied from gate G2 to this memory SCM; and outputs VA3, VA0 are supplied from selector LAS to increase a write speed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4557279A JPS55138144A (en) | 1979-04-13 | 1979-04-13 | Data write system of crt display unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4557279A JPS55138144A (en) | 1979-04-13 | 1979-04-13 | Data write system of crt display unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55138144A true JPS55138144A (en) | 1980-10-28 |
Family
ID=12723053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4557279A Pending JPS55138144A (en) | 1979-04-13 | 1979-04-13 | Data write system of crt display unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55138144A (en) |
-
1979
- 1979-04-13 JP JP4557279A patent/JPS55138144A/en active Pending
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