Abstract: An expansion module for use in a computer system is disclosed. The expansion module holds a first card, which has a data processing unit and associated memory coupled together via a high speed internal local bus and an external coupler for an external peripheral device. An expansion coupler is also provided for coupling a second expansion card to the first card. The expansion module has a system connector for connecting the expansion module to a lower speed input-output bus of a computer system. The module can also accommodate additional SIMM modules as its associated memory. The module uses sidewalls or book covers made of a shielding material to provide electrical shielding and protection from external conditions. The expansion module improves the upgradeability and expandability of a data processing system.

Abstract: A structure is shown having three stages for guiding a system component into an operatively mounted position within an enclosure while simultaneously making a blind attachment of the electrical connectors to complete the power and signal circuits between the component and system contained within the enclosure. A coarse positioning structure includes a guide rail means for directing the component toward the operative, mounted position; an intermediate positioning structure functions within the tolerance of the coarse positioning means to substantially align the component including the electrical connectors and a fine positioning means aligns the electrical connectors for the final positioning as the component is latched into the operating position and electrical connections are completed. The three positioning functions are intitated serially.

Abstract: A pluggable assembly for enclosing printed circuit cards used in electronic devices. The enclosure is completely shielded and is particularly adapted to use in circumstances where unskilled persons either plug or unplug the assembly into a backplane assembly.

Abstract: A plugable interposer assembly for enclosing printed circuit cards used in electronic devices and accommodating the connection of cables and additional printed circuit card enclosures. The enclosure is completely shielded and is particularly adapted to use in circumstances where unskilled persons either plug or unplug the assembly into a backplane assembly.