Abstract: Card reading apparatus capable of accepting different sized disconnectible electronic cards, including memory storage cards such as larger smart cards and smaller S.I.M. (signature identification module) cards, includes a reader housing assembly which encloses a connection chamber. A conventional connector in the connection chamber has a plurality of resilient contacts projecting toward a course to be taken by a memory storage card as it is inserted through an entry slot into the housing assembly. Each memory storage card is rectangular and includes a similarly sized and positioned plurality of contact pads thereon for mechanical and electrical engagement, respectively, with the plurality of resilient contacts on the connector in the connection chamber when inserted into the connection chamber through the entry slot and advanced to a seated position.