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In this study do ADC0809 A/D conversion experiments. ADC0809 is an 8-channel analog inputs, 8 digital outputs successive approximation A/D devices, the conversion time is about 100us, conversion accuracy of 1/512, suitable for multi-channel data acquisition system. There are three-state output data latch inside ADC0809 chip, it can interface directly with the 8088 microprocessor bus.