I think about selling my Activision prototpye games for the Intellivision. Not sure if I am going to put them up on eBay... Here's the stuff:   Happy Trails Writing on label: LAB PROTOTYPE Happy Trails TM MP-003 pr. #25 © 1983 Activision, Inc. Weight: 63 grams EPROM board Works fine.   The Dreadnaught Factor Writing on label: THE DREADNAUGHT FACTOR TM MZ-004 © 1983 Activision, Inc. Weight: 41 grams Most likely production board The cart gave me a hard time to keep contact with