Yep, it was a dongle that plugged into the joystick port, like Scala (in the early days. Later Scala was cheaper and no dongle)
Wasn't the dongle that put me off Lightwave, was the price. I had just paid for the A4000T and all I had left was about £150 for Cinema 4D (if I remember the price correctly, it was 1996 after all)