此程序为一可编程并行接口实验源程序，通过此实验可掌握8255方式0的工作原理及使用方法。编程从8255C口输入数据，再从A口输出。-procedure for a programmable parallel interface experiment source, the passage of this experiment can seize 8,255 0 means the working principle and methods of use. Programming from the

此程序为一竞赛抢答器模拟实验源程序，采用8255并行接口编程。-Contest for a simulation experiment source, using 8,255 parallel interface programming.