Decided to give the hack tools a try using hakchi2 - it makes it a simple process to add new games and works perfectly - added 1942, 1943, Arch Rivals, BurgerTime, DigDug, DK3, Elavator Action, Galaxian, Gauntlet, Joust, Lode Runner, and Metal Gear. And they all show up and play fine on the emulator.