Abstract: A unit for providing a socket for a plurality of removably mountable peripheral devices to a computer including a receptacle for receiving the body of such removably mountable peripheral devices, the receptacle being generally block shaped and having a pair of generally-parallel generally-rectangular outer surfaces separated by a distance which is small compared to dimensions of the rectangular surfaces, the receptacle including conductors for electrically connecting to any such removably mountable peripheral devices and being designed to fit within the interior of a computer; a first circuit board having a generally-rectangular shape; interface circuitry for effecting a connection of such removably mountable peripheral devices to a bus of a computer within which the unit is positioned, the interface circuitry being mounted on the first circuit board and having electrical connections on the surface of the first circuit board to the receptacle, the first circuit board being mounted to the receptacle; a second