Thanks again for the ideas. Alain what makes yours special/sneaky?

I note that in my original table the 3rd character of the hex words 100V = $2C30 (3) in this case is never a letter A,B,C,D,E,F
Either I got lucky with my samples or something else is happening.

I was wondering if we are seeing the output from a 12bit ADC 4096 packed into those twelve bits.