EBME Forums Forums Maintenance Test Equipment About Timeter RT-200

Finding signals takes time,I finished part of the work,Please refer to the definition of U9,I found the power supply and negative,The negative pole of Intel 8255 is not pin P8,But I think it should be a similar MCU

The J2 interface is based on my current signal trend,It looks like it is communicating with U9，Read or write EEPROM via U9