I see no one is really eager to dive into this one LOL. I think I know what the issue is with this. If I put in all new neurons, nodes, whatever they ate called, it is lacking the programming for the 3rd and 4th floor call buttons. I am pretty sure I have to address I/Os for this. What I don't know is, which ones do I use? How many SPI boards do I have, I think its 1, but are the neurons SPI boards or is the car station board with the 2 neurons in it called the SPI board. I know I'm getting closer to the solution. If anyone has ever adjusted one of these and can just give any info on it, books, whatever, I'd appreciate it. I am aware this was a short lived, experimental, sorta elevator, even shorter lived than TKE's Wonderful ISIS, so people that are knowledgeable on this are few and far between. Thanks.