I did not - it's not a Y cable. Pin outs are different on the one end. I think they say to use the black cable because the keyspan converter won't plug directly into the legacy base because of the lugs. I used a straight Y cable. The problem is hard to detect because most commands go through.
Try it with the original Legacy Y cable. As I understand it, the computer connection will then be using a dedicated serial port into the Legacy Base and the rest of your accessories (specifically, the ARC) should function correctly without having to unplug the computer.
rudy
director of audio
Lionel, LLC
