本文分析了CCDOS显示器控制模块及其工作原理,介绍如何改造其中的功能子模块,从而实现汉字放大显示的方法。汉字的显示输出过程,实际上是把汉字机内码转换成对应的汉字模,再把字模送屏幕显示的过程。汉字的基本因素是点。点阵汉字图形是用二进制数据来描述的。用二进制表示的汉字点阵数 This paper analyzes the CCDOS display control module and its working principle, describes how to transform the functional sub-module, in order to achieve a larger display of Chinese characters. Chinese characters display output process, in fact, is the Chinese character code conversion into the corresponding Chinese character model, then the font sent to the screen display process. The basic factor of Chinese characters is point. Dot matrix Chinese characters are described in binary data. The number of Chinese dot matrix expressed in binary