微机原理与接口实验指导，包括：A/D转换实验、 D/A转换实验、255A并行口实验、定时器/计数器、数据排序程序、红绿交通灯实验等等 -computer interface experiment with the principles of the guide, include : A/D conversion experiments, the D/A conversion experiments, experimental 255A parallel port, timer/counter