the bit image mode of the 24 pin printer; the programming technique of reading data of EGA/VGA graph memory and converting the data into the bit image format to print it; the skill of TSR (Terminate and Stay Resident);

• 本文以EGA/VGA为例介绍了EGA/VGA图形显示的原理和图形内存数据的存取方法,24针打印机的图形打印的工作方式,取EGA/VGA的图形内存映像数据后经过滤色转换成打印机的打印格式数据的编程技巧,程序驻留内存的处理方法,图形拷贝参数的带入方法。