说明：  在51单片机上实现了乒乓球游戏，用到了8个LED模拟乒乓球的运动，然后用数码管显示比分和局分，还用到了两个开关来选择11/21分制，三局两胜/五局三胜。全部程序是用汇编编写的。
(51 SCM is used for the table tennis game. We use 8 LEDs to simulate the motion of table tennis, and dislay scores and global scores on digital tuble, also use two switches to select the 11/21 points system, the rule ofthe game. All code is written in assembler.)