I took a stab at reading the input on this chip. I referenced the attached data sheet and found pin 13. Am I reading that right? Regardless I got no signal on any of the pins on that chip. Only some highs and lows. I did see some wave forms in the 28 pin Z4 chip but not on the corresponding pin19. Because of that I feel like the scope is connected properly and functioning as it should. Perhaps that 366 chip is bad as suggested above?