自制时钟及时钟中断处理程序的编制

在CMD下运行，在右上角将出现当前的时间，同时可以输入CMD下的各种命令

相当于把单任务的操作系统改成多任务（一个显示时间，一个处理各种命令）-homemade clocks and clock interrupt handling procedures in the establishment of CMD running, in the upper right-hand corner there will be the current time, CMD also can be imported under the order amounts to a single task into multi-task operating system (a show, deal with a variety of orders)