(...) This might be old news, but I just tried it anyway... You can connect an RCX motor port to a CyberMaster sensor port and vice versa and get tri-state info. You can distinguish between the motor floating, off, and one of forward or reverse (...) (20 years ago, 11-Jun-04, to lugnet.robotics.cybermaster, lugnet.robotics.rcx)
(...) I think it's theoretically possible to communicate an 8 state signal from the RCX to the Cybermaster's passive sensor port. The passive sensor port measures resistance as well as using a switch - the 3 switches in the cybermaster set have (...) (20 years ago, 11-Jun-04, to lugnet.robotics.cybermaster, lugnet.robotics.rcx)
