说明：  程序中利用改中断的方法，修改了INT1C和INT1B的中断地址入口。从而实现显示时间各退出程序的功能。在程序中还调用了旧的INT1C，使该程序不会影响其它程序的运行。
(procedures for the use of the interruption change, and revised the INT1C INT1B address the interruption entrance. Show time so as to achieve the exit function. The procedures also call the old INT1C so that the procedures do not affect the operation of other programs.)