I've got a Model 6000 load generator and Model 8000 handlebar controller that uses the Nintendo. I also have the Nintendo and the FTDI USB to stereo adapter if you have a newer handlebar controller and want to use that.

Setup works in standalone mode or with Zwift using a newer HC, not this one. When my wife was not riding her CompuTrainer, I borrowed her HC and everything worked fine.

Will sell the whole thing for $350 + shipping or best offer. In Boston area and willing to travel up to 80-ish miles to deliver.