I have one of the 4.5v Lego/Dacta Robotics kits that hooks up to my Apple IIe (conveniently making this post on-topic). I bought it through the school when Lego discontinued the kits last year. The system is based on Logo. The motors and sensors connect to the external interface box, which is connected to the Apple IIe via a 20 pin ribbon cable and interface card (which I think is really just a scaled down serial card). There are touch sensors, optosensors, motors, and lights for the kit. I currently have mine set up around my 9v Lego train, using the sensors to detect when it passes, the motors to raise and lower the crossing gates. There's nothing better than mixing computers and Lego! Tom Owad -- Sysop of Caesarville Online Client software at: <http://home.earthlink.net/~tomowad/>