下面为一个简单的双机通信程序，分为主机和从机程序。程序使用Keil C51和Proteus联调成功。程序还有很多 可以改进的地方，请各位赐教。-Below for a simple two-machine communication program, the program is divided into master and slave. The program uses the Keil C51 and Proteus FBI successfully. Program there are a lot of areas for improvement, please enlighten me.