It's fun to imagine where this might have gone had Atari not shifted their strategy entirely to PC's after the '83 video game crash (and if more of us here had the time, it'd be an awesome project platform to start producing an open interface with many of the aforementioned expansion cards), but the potential of the 1090 was always limited by the 8-bit XL series itself—IMO it's a cool relic of transition and adaptation to changing technological markets, done just a bit too late.