本实验主要是编制和调试一个自制时钟，在屏幕右上角显示当时的时间：按хх.хх.хх形式显示,并且能正确进位,24小时应清零。同时，在显示时间时，DOS系统能正确处理各种命令，正确执行应用程序。-this experiment is compiled and debug a homemade clock in the upper right screen shows the time : by Xx. Xx. Xx form, and can correct rounding, 24 hours should be reset. At the same time, show time, the DOS system can correctly handle all orders and correctly implement the applications.