At some point in the intervening 6 years (lol) since I posted this message, I put in a concerted effort and made it much farther than I ever had before. Can't remember exactly how far but it was at least half way through the game. Still one of my all time favorites on the Intellivision. The disc control is great, side buttons not so much. Can't remember if I tried on intvdave's version or not, I'll have to check and see soon...