Notes on VIPERSoft BASIC with Built-In Interface By Paul Thacker June 19, 2014 (as posted to the BallyAlley Yahoo Group) I have the VIPERSoft BASIC cart with the 2000 baud interface. It came from Bob Fabris' collection. As far as I can tell, the software isn't sufficiently developed to load a program regardless of whether or not the interface works. It runs enough to bring up a prompt, but I couldn't get it to do anything useful. If anyone wants to experiment with it, it's included in the ROM set. It will run in MESS if you select a large enough RAM expansion and do a soft reset in MESS after loading the cart. Of course, you couldn't load a program this way. Paul