利用微机串口1（COM1，地址为3F8H－3FFH）完成2台计算机之间的通信，要求通信双方可以互相问候，利用微机完成设计。主要参数：异步串行通信技术，8250编程技术和微机串口通信技术-The use of computer serial port 1 (COM1, address 3F8H-3FFH) the completion of Units 2 communications between computers, the two sides can request communications exchanged greetings, complete the design using computer. Main parameters: asynchronous serial communication technology, 8250 programming techniques and computer serial port communication technology