Interesting!!!
I have a "paperweight" of the Willem right here. Bought it for 2732, actually got it to a point where it said it had programmed them, but it didnt work.
Would love to know what you did, having a working programmer would be a refreshing change!
There are a quite a few different versions as I mentioned, but if you have the one that I have, then this should work for you.
I have a few tricks that I will be sharing about programming specific ROM's on this programmer soon...