I have both-the one from 5-11under with dip switches and the one from Kjell Baut. Carlsson is right-there are 2 dials with 8 steps each in the cart, which makes it 64 games in total. The cartridge itself has a nice plexiglass transparent back with 2 drillholes in it, that you can choose the games and you can see the insight. The cartridge even has a drillhole for the screwdriver in it, that it did not get lost, when you dont use it-I find that very handy. Included is also a laminated sheet with all games on it (which position is which game).
Its very easy to change the games-there is an arrow showing in which position you are.