Watch eBay. there have been a bunch of these dumped onto the market there recently. There is a group at the Computer History Museum who were ex Convergent Tech folks trying to find docs and software as well for this family of systems. Sadly, very little has surfaced. There is a book called "Exploring CTOS" that you may be able to find. http://www.geocities.com/SiliconValley/Pines/4011/ has a bit of info as well