So it was MIDI! I suspected as much but could not find any documentation. Funny that since it was the first network I've seen I was naturally expecting all net

So it was MIDI! I suspected as much but could not find any documentation. Funny that since it was the first network I've seen I was naturally expecting all networks to use mini-DIN cables and daisy chaining. The next network, many years later, was a co-axial setup - my mind was blown.