I have two displays I purchased from GHI, and I can only get one of them to work:
B&W 128x64-Pixel Display http://www.ghielectronics.com/catalog/product/208
Graphical 3.6" Display (no longer for sale)
The 3.6" display works great (beautiful display, BTW), but the smaller FEZ-Disp I cannot get to work. I’m wondering if they use the same controller, meaning I can use the same driver for both?