JPH01173788U

JPH01173788U -

Info

Publication number: JPH01173788U
Application number: JP6994588U
Authority: JP
Priority date: 1988-05-27
Filing date: 1988-05-27
Publication date: 1989-12-11

Description

[Brief explanation of drawings]

第１図は本考案を実施した表示制御装置の構成
を表わす図、第２図は本考案装置の動作を表わす
タイムチヤート、第３図はリフレツシユ・メモリ
６１，６２の動作を説明するための図、第４図は
従来の表示制御装置の構成を表わす図、第５図ａ
，ｂはスクロール操作の際のラインポインタ９，
リフレツシユ・メモリ６１，６２，ＣＲＴ２の状
態を表わす図である。１……ＭＰＵ、２……ＣＲＴ、３，１１，１９
……データ切換器、４，８，２０……書き込みパ
ルス切換器、５，７，１７……アドレス切換器、
６１，６２……リフレツシユ・メモリ、９……ラ
インポインタ、１０……ＣＲＴコントローラ、１
２……加算回路、１３……キヤラクタ・ジエネレ
ータ、１４……Ｐ／Ｓ変換器、１５……ビデオ回
路、１６……起動回路、１８……パターン・レジ
スタ、２１……終了検出回路、２２……割り込み
発生回路、ＣＢ……制御バス、ＡＢ……アドレス
・バス、ＤＢ……データ・バス。 FIG. 1 is a diagram showing the configuration of a display control device embodying the present invention, FIG. 2 is a time chart showing the operation of the device of the present invention, and FIG. 3 is a diagram for explaining the operation of the refresh memories 61 and 62. , Fig. 4 is a diagram showing the configuration of a conventional display control device, Fig. 5a
, b is the line pointer 9 during scroll operation,
3 is a diagram showing the states of refresh memories 61, 62, and CRT 2. FIG. 1...MPU, 2...CRT, 3, 11, 19
...Data switcher, 4,8,20...Write pulse switcher, 5,7,17...Address switcher,
61, 62... Refresh memory, 9... Line pointer, 10... CRT controller, 1
2...Addition circuit, 13...Character generator, 14...P/S converter, 15...Video circuit, 16...Start circuit, 18...Pattern register, 21...End detection circuit, 22... ...Interrupt generation circuit, CB...Control bus, AB...Address bus, DB...Data bus.

Claims

[Scope of utility model registration request]

CR that generates consecutive addresses used for display
A CRT display comprising a T controller, a refresh memory in which character codes and their attributes are stored, a character generator that outputs character patterns according to the refresh memory, and a video circuit that generates display control signals. In the display control device to be controlled, a pattern register storing one line of character data and a specified position are detected and the display is turned off, and one line of character data in the pattern register is written to the refresh memory. 1. A display control device comprising: means.