大图形在VGA方式下快速移动

Fast Moving Big Bit Image over VGA

研究了一种上下左右连续移动大图形的方法，不用刷新整个屏幕，仅修改被移入部分的图形，从而达到图形的快速移动。

A method for fast moving big bit image over VGA is developed. Moved screen bit image data in video RAM are changed, only, with the method, and other bit image data in video RAM keep unchanged.