VersaLogic's SPX expansion modules provide a new level of economy and convenience for routine I/O expansion. Their small size, low cost, and simplified system interface are possible due to high levels of integration and miniaturization that were not previously available. Unlike larger expansion formats such as PC/104, the extremely compact SPX format does not require a stacking connector or a position in the expansion stack. Connected by a single 14-pin cable to any SPX-enabled base board, SPX expansion modules can be mounted in any position, up to two feet from the host. The small (1.2" x 3.8") SPX modules may optionally be attached to the base board using PC/104 stand-offs. Up to four SPX modules can be daisy-chained together to meet targeted I/O requirements at a substantial cost and space savings.