设计目的：对PC机的8250串行通讯接口(COM1、COM2)进行接口编程，通过使用RS232标准的串行通信线实现两机间的串行通信

基本是求：实现两机间远程键盘（字符即时传送）功能和普通文本的复制（文本传送）功能

高级要求：1、使用中断实现两机间的通信；2、能够传送计算机上一般的二进制文件；3、传送速度达到38Kbps以上。-designed : PC 8250 serial communication interface (COM1, COM2) interface programming, through the use of standard RS232 serial communication lines to achieve the two-Serial Communication is the basic demand : to achieve two long-range aircraft between keyboard (the character immediate delivery) and the general functional copy of the text (text message) capabilities senior requirements : one, the use of two aircraft to achieve interruption of communication; 2, capable of delivering a general computer binary files; 3. transmission speed of 38Kbps and above.