Description: Intel8255 port using data cable with the exception of the map outside the IN0 ~ IN7 pin connection. Procedural steps: (1) According to the analog signal input connection means (JP10 jumper connected with the potentiometer 1, if the jumper JP10 removed can be Potentiometers for analog signal input 2), select the analog channel, namely, the election set addC, addB, accA composed of three binary data (2) At the same time so that START and ALE effective, so select the appropriate ADC0809 analog signal and conversion (3) wait for EOC appears high (4) to enable the OE for the high electrical ping, which allows读出数据from ADC0809
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