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在电力系统应用软件图形开发中,面临着如何充分利用EGA/VGA/TVGA提供的资源,在微机屏幕上绘制各种复杂的电力系统电气接线图,或显示大规模区域电网的地理接线图的问题。介绍了EGA/VGA/TVGA的硬件结构及其主要端口寄存器和控制寄存器的访问方法,并提供了可实现大于物理屏的逻辑屏和解决屏幕滚动中出现的抖动问题的解决方案。该程序通过在电网规划软件包的应用,表明了此方法是有效的。
In the power system application graphic development, facing the problem of how to make full use of the resources provided by EGA / VGA / TVGA, drawing various complicated electrical system wiring diagrams on the computer screen or displaying the geographical wiring diagram of large-scale regional power grid . Introduced the hardware structure of EGA / VGA / TVGA and the access method of its main port registers and control registers, and provided a logic screen that can realize more than the physical screen and a solution to the jitter problem that appeared in the screen scrolling. This program shows that this method is effective through the application of the software package in the power grid.