As you have seen, he could record the entire protocol with segmented memory. There is also a type of instruments called "logic analyzer" or mixed oscilloscope,

As you have seen, he could record the entire protocol with segmented memory. There is also a type of instruments called "logic analyzer" or mixed oscilloscope, where you just watch a digital signal, one or zero. The analog scope signal does say so much more than just one or zero. Of course he didn't needed really the analog signal, but it looks nice.