以CGA卡为基础的智能显示系统  

AN INTELLIGENT CRT DISPLAY SYSTEM BASED ON CGA CARD

作　　者：尹学军[1] 杨楚民[1] 

机构地区：[1]华中理工大学

出　　处：《小型微型计算机系统》1994年第4期47-50,共4页Journal of Chinese Computer Systems

摘　　要：本文介绍了以微处理器与ＩＢＭ－ＰＣ上的彩色／图形适配器（ＣＧＡ卡）相结合构成的一种智能显示系统。本系统主要解决数控系统中主ＣＰＵ与６８４５ＣＲＴＣ争夺显示缓存的矛盾。保证了６８４５ＣＲＴＣ对显示缓存操作的时间要求；并且保证了数控系统中主ＣＰＵ对显示缓存操作的随意性。The paper introduces an intelligent CRT display system which consists of microcomputer and CGA card. This intelligent system mainly solves the contention for VRAM between the main CPU in CNC system and 6845 CRTC so that 6845 CRTC of display system can visit VRAM during required period and the main CPU of CNC system can visit VRAM whenever necessary.

关 键 词：CCGA卡 智能显示系统 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]