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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)