这是一个应用在51单片机上的用汇编编写的一个小程序，来实现单片机自身循环串行通信-This is a single-chip microcomputer used in 51 of the compilation prepared by a small process, to achieve their own cycle of single-chip serial communication

一个8250串口通信的汇编小程序.异步，双工-A 8250 compilation of serial communication applet. Asynchronous, duplex