Gracias too Tim and Bruce for the answer to my board question. I have the 16-channel RS232 port assembly that goes on the other end of this... I just didn't know what it hooked up to.. till now. What started this was taking an inventory of the 1/44 to see about fitting an RL11 into it, thus to begin using RL02s. Of course this rash activity is bound to generate a small flurry of further perplexities... at least I've got full docs on everything. Cheerz John