Which games use the Color/B&W switch for game functionality? I don't recall running across any aside from Starmaster. And maybe Space Shuttle?   ==== Here's a list of the games mentioned in the thread, for future reference:   Beany Bopper (pause function) Bump 'n' Jump (background music on/off) Cosmic Ark [later version] (disables 'background stars' effect) Fast Eddie (pause function) Ghost Manor (selects protagonist's gender) Journey Escape (turn star field effect on/off) Off t