8255：（1）基本输入输出实验：本实验使8255 端口A工作在方式0 并作为输入口，端口B工作在方式0 并作为输出口。用一组开关信号接入端口A，端口B 输出线接至一组数据灯上，然后通过对8255 芯片编程来实现输入输出功能。（2）流水灯显示程序，从d7到d0，从d8到d15灯同时依次亮

8251：（1）数据信号的串行传输

发送往串口的数据会以串行格式从TXD 引脚输出，编写程序，观察串行输出的格式。(2)自收自发实验

通过自收自发实验，可以验证硬件及软机设计，常用于自测试。-8255: (1) basic input-output experiment: The experimental work in the 8255 Port A as input port mode 0, port B operate in mode 0 and as output. Switching signal with a set of access ports A, B port output line connected to a set of data light, and then program the chip by 8255 to achieve the input and output functions. (2) water lights display program, from d7 to d0, d8 to d15 light from the light 8251 at the same time in order: (1) serial transmission of data signals sent to the serial port to serial format data from the TXD pin, programming to observe the serial output format. (2) Since the income from the collection by the spontaneous self-test experiments to verify the hardware and software machine design, commonly used in self-test.