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个数据存入内存中。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。-Use ADC0809 channel 0, 0-5V DC voltage access and adjust the analog voltage value WR potentiometer, A/D conversion end signal EOC 8259A is connected to the main IR5, collecting 100 data stored in memory. Repeatedly adjust the 0-5V voltage (W1 rotating knob), the A/D acquisition memory and observing the changes in the data.