The 271 and 471 require the addition of a UX-14 level adapter in order to have CI-V capabilities. You will need one for each rig. Icom quit manufacturing them for awhile, then responded to continuing demand and began filling orders. They should be readily available new. -- Mark D. Johns, K0MDJ (formerly WA0RGV) Cedar Falls, Iowa EN32sm "Heaven goes by favour. If it went by merit, you would stay out and your dog would go in." -- Mark Twain Phil Heath wrote: > I have an IC271E and IC471E and want to control these by computer. The > rigs have provision for an optional computer control board, about 40mm x > 50mm in size, and a slot in the back of the rig for a DB25 connector. > The manual makes no further reference to this accessory.