A connector apparatus for a card-like data processing medium has an ejection mechanism for discharging the card-like data processing medium from the connector apparatus and a lock button to lock a push rod of the ejection mechanism in place to prevent inadvertent ejection of the card-like data processing medium. The ejection mechanism includes a slidable plate that is movably mounted on a frame of the connector apparatus and that engages the card-like data processing medium. A pivotal lever for transmitting movement of a push rod into movement of the slidable plate is rotatably mounted on the frame. In an alternate embodiment, the pivotal lever is replaced by a plurality of gears that transmit movement of the push rod into movement of the slidable plate. The lock button is moveable relative to the side rail and engages the push rod to lock the push rod in place. An abutment surface on the frame may prevent the lock button from disengaging with the push rod while the lock button is disposed in a particular position.