Abstract: An enclosed matrix programming board or connecting means for joining two circuits includes connecting bars formed with split, cylindrical sockets for each connecting position and held in place by an insulator block formed with a hole for each connecting socket. Connecting pins are applied through a perforated cover plate and join a conductive bar placed in one position with a similar bar orthogonal to it. Each bar is connected to a pin extending a short distance from one of the cover plates for connection to an exterior circuit. Double connector pins, containing a diode in the handle, may be used to restrict the connecting current to one direction only. Parallel ribs are provided on the cover plates for mechanically and electrically isolating the connecting bars.

Abstract: A hollow closed end cylindrical metal conductor for connecting conductors attached to the surfaces of a plurality of printed circuit boards. One end of the cylindrical conductor is formed with an outwardly extending flange which limits against the top surface of the top circuit board. The other end of the cylindrical conductor is first formed in a cone, inserted into and through axial holes in all the boards, and is then forceably deformed to extend beyond the bottom edge of the hole in the bottom board. Molten solder is next applied to the array and the cylindrical conductor and all the adjoining ends of the conductors on the circuit boards are connected to each other. In an alternate embodiment, the electrical connector is provided with a knurled body portion for forming an interference fit with the conductors on the circuit boards.