An external expanding apparatus or "docking station" operable with a portable computer device of a type having a display unit having a display screen on an inner surface thereof and a hard shell backing surface opposite thereof and pivotally mounted on a substantially rigid casing having a pair of locating holes adjacent to opposite corners of a substantially planar bottom surface thereof, and an input/output (I/O) connector exposed on a surface thereof with a pair of positioning apertures provided on opposite sides thereof. The docking station having a rotatable display unit support with a display unit clamping mechanism at one end thereof adapted to resiliently clamp the computer's display unit.