使用ADC0809的通道0，接入0-5V的直流电压，用WR电位器调整模拟电压值，A/D的转换结束信号EOC接在主8259A的IR5上，采集100个数据并存入内存中，同时将采集的16进制数据显示在数码管上。请多次调整0-5V的电压值（旋动W1旋钮），进行A/D采集，并观测内存中的数据的变化情况。(The channel 0 of ADC0809 is used to connect to the DC voltage of 0-5V, to adjust the analog voltage value with WR potentiometer. The end of A/D conversion ends EOC to the IR5 of main 8259A, collecting 100 data and storing it in memory, and collecting the 16 binary data displayed on the digital tube. Please adjust the voltage value of 0-5V times (W1, A/D rotating knob) acquisition, change was observed in memory data.)