Scroller Demo (Bob Colbert) (PD) ROM for Atari 2600 (A2600). Scroller Demo (Bob Colbert) (PD) game is available to play online and only onRoms Games. Scroller Demo (Bob Colbert) (PD) ROM for Atari 2600 requires an emulator to play the game offline. This Game is English (USA) Version and is the highest quality available.