Abstract: A planar generally rectangular, multi-edge extender board has a plurality of spaced terminals along adjacent edges thereof or along three or four of its edges. Each of the edge terminals is coupled by means of a conductor to either a terminal on an opposed edge of the extender board or to a multi-pin connector mounted to an inner portion of the extender board. The edge terminals of the extender board are adapted for insertion in and coupling to either a connector in an equipment rack in which the circuit board is used or direct coupling to the circuit board itself. The multi-pin connector allows the edge-mounted terminals of the extender board to be coupled via a multi-conductor ribbon cable to corresponding edge terminals of a circuit board removed from the equipment rack.