微机原理的实验报告(含源码，经过测试可用)，包含用74LS244和74LS273组成输入输出混合接口的设计和测试，模数转换器AD0809将输入的电平数据转换成十六进制数，8255芯片用方式0实现跑马灯和控制数码管循环显示A,b,C,d.(基于DOS环境和TD－PIT实验装置,面包板)-Microcomputer Principle of test report (including source code, tested and available), including the use 74LS244 and 74LS273 mixed input and output interface consisting of design and testing, AD0809 analog-level data will be entered into a hexadecimal number 8255 chip 0 marquees and in a way to achieve control of the digital control loop to display A, b, C, d. (DOS-based environment and TD-PIT experimental device, breadboard)