文件名称:light
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利用8255输入8位开关信号，并视其为位16进制数字，在计算机显示屏幕上输出（或在八位发光二级管输出）
pa输入开关信号，pb输出发光二级管-The use of 8255 input 8-bit switch signal, and as 16-bit hexadecimal numbers in the computer display screen on the output (or 8 LED output) pa input signal switch, pb output LED
pa输入开关信号，pb输出发光二级管-The use of 8255 input 8-bit switch signal, and as 16-bit hexadecimal numbers in the computer display screen on the output (or 8 LED output) pa input signal switch, pb output LED
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light.txt