Hi, T S1 and Robbie. I don't believe the adapter or, for that matter, the printer itself even enters the troubleshooting equation yet. It is normally possible to select a printer driver in the chooser for a printer one doesn't even have available, as long as the driver extension for that printer is correctly installed and not corrupt. Years ago I used to do so all the time, selecting the LaserWriter driver when I wanted to format a document to print correctly on a LaserWriter at a service bureau (before I had a laser printer of my own).
Therefore, I have to wonder whether the driver is correctly installed. If it was copied from a Mac on which the IW works properly, then it isn't corrupt. T S1, make sure the iW driver is in your Extensions folder and that it's enabled in the Extensions Manager. Rebuild your desktop to make sure it's correctly identified by the Finder, and run Disk First Aid to make sure your hard drive directory is in good order. Then restart and test again to see whether the IW driver appears in the left pane of the Chooser. Until it does, the printer and the adapter themselves are irrelevancies.