说明：  8259A中断控制器,数码管从一到九反复显示，有中断来时数码管全灭。键盘上有任意键按下或者已经中断了十次就自动退出执行。而且在计算机屏幕上显示这是第几次中断。
(8259A interrupt controller, digital control from 1-9 repeatedly shown that when the digital control Quanmie interrupt. Press any key on the keyboard has been suspended 10 times or automatically out of the implementation. And the computer screen a few times this is the first break.)