微机接口技术--电子钟设计，好的话就顶一下，资源共享最重要-Computer interface technology- electronic clock design, on top of what is good, the most important resource sharing

数字显示电子钟: 利用微机现有资源，编写程序在PC屏幕上显示运行的时钟，要求和系统时钟一致。-Digital display clock: the use of computer resources available to program the PC to run the clock on the screen, the same requirements and the system clock.