理解键盘和显示器接口的工作原理，掌握BIOS键盘和显示器中断调用的使用方法，掌握复杂内存数据结构的定义和管理方法。具体的设计任务及要求-The keyboard and display interface to understand the working principle, control the keyboard and display BIOS interrupt call to use to master the complex memory data structure definitions and management methods. The specific design tasks and requirements