I gotta say a big thanks to wizard for MFME5 because its SRU element actually helped solve the mystery of this ...
Eachway shuffle out of Johnnys Amusements , unfortunately that arcade is closing soon , so the non working machines from the retro are coming through for repair on and off so that they are working for when they enter the owners private collection. Thought there was a CPU or RAM /ROM problem at first but it turned out to be how its reading the switch lines!
Enjoy the video , and yes i know I ramble and get lost in confusion in my commentary but the machine understood what I was getting at!!