使用可编程并行I/O接口芯片8255、地址译码器、七段数码管等硬件，搭建七段数码管显示装置，实现键盘输入两个数字的ASCII码、数码管可动态显示这两个数字的功能。(Using programmable parallel I/O interface chip 8255, address decoder, seven segment digital tube and other hardware, build seven segment digital tube display device, realize the keyboard input of two numbers of ASCII code, the digital tube can dynamically display the functions of the two numbers.)