Any thing is possible..Pleasures of not having the decoder in hand.?
The NCE Powercab has this Standard Programming setup for decoders and first thing it does is determine the decoder manufacturer.
So it is quite possible it is reading 82 on CV8 and since JMRI says HAG is 81, gets lost in the shuffle.? But again there are no
definition files for manuf# 81 or 82? but it could be rebranded ESU or Uhlenbrock decoder as you say.
Marc
