Abstract: An extender card for extending a PCMCIA bus, to permit development of a PCMCIA board on a host notebook computer which also may be the intended target notebook computer on which the PCMCIA board will be used. The extender card includes a PCMCIA header, a PCMCIA receptacle, and a plurality of wirewrap pins, all coupled by a plurality of conductors. A ground plane and a plurality of ground conductors provide noise immunity. A power plane provides good conductivity for VCC. The extender card is sized and shaped to be inserted into the notebook computer through a conventional access opening into a PCMCIA receptacle within the notebook computer, and to extend out that opening to permit easy access. A PCMCIA board under development may be coupled to the extended PCMCIA bus lines via the extender card's wirewrap pins or its PCMCIA receptacle.