说明：  汇编课的作业，右上角显示系统时间，倒计时。若倒计时结束发声并显示提示信息。 使用说明：cmd中运行，按S键倒计时开始，按P倒计时暂停。 主要技术：设置新的中断向量(1CH,9H)，中断驻留，发声，显示系统时间
(Compilation of class operations, the upper right corner of display system time and the countdown. If the countdown to the end of sound and display message. Use: cmd in the run, according to S keys to start the countdown, countdown to the suspension according to P. The main technology: a new interrupt vector (1CH, 9H), disruption of presence, voice, display system time)