This is an awesome amount of data. I am going to try to trace through my 6397 here and find the A/D outputs that you have listed, see if I can lift the pullup/pulldown resistors and reconfigure it as a "normalized" 0-5V standard analog input for WBO2 monitoring. I just got home from the gulf coast so I'll get those comparison shots of the internals of a 4737 and 6397 today and get them posted up here, hopefully that helps some.