说明：  实验一 交通灯控制实验 2 实验二 可编程定时器/计数器 8 实验三、可编程中断控制器 15 实验四 模/数转换器 A/DC0809 23 五、双机串行通讯 30 六、竞赛抢答器 39 汇编程序源码及电路原理
(Experiment a traffic light control experiment 2 experiment two programmable timer/counter 8 third experiment, experiment four programmable interrupt controller 15 analog/digital converter A/DC0809 23 V. Dual Serial Communications 30 VI Contest for 39 assembler source code and circuit schematics)