Thinking of reverse engineering the firmware again. It's almost impossible, unless I purchase another working one and clone its content, or its dump is available somewhere, because I only know what's shown is not right (because not making sense) but don't know what should be shown!
Anyway, have I now catched the tail of a bad guy? I'm probing the clock signal going into NS65118 (pin 21, coming from pin 11 of one of the two uCs, MAB8031, which TxD/P3.1 serial output), which is obviously critical, regardless whether the input data is correct or is garbage. My question here is, why does it look so messy? I think it should be very close to a square waveform? Thoughts?
The scope setting is 0.5us/div and 1V/div. So the clock signal is about 1MHz with p2p voltage 4V-ish.