Abstract: A computer system includes a "motherboard" comprising two separate boards: an input/output (I/O) board and a logic board. The I/O board, which includes functionality for interfacing and controlling the computers input/output functions, is substantially platform-independent. It is secured into the housing in the manner of a conventional motherboard. The logic board, which includes a processor, processor controller and/or processor memory, is platform-specific. It is slidably (or otherwise easily) removable from the housing, e.g., without disassembly thereof.

Abstract: An improved computer chassis and cover assembly that includes an apparatus and method for installation and replacement of the computer CPU or SIMMs chips without removal of the cover. This permits quick and easy upgrading of the computer CPU or SIMMs memory boards as their prices drop or as changes occur. The invention also allows vendors to purchase expensive and price volatile CPU's and SIMMs memory boards on an "as needed" basis, eliminating warehousing of commodities whose prices may drop suddenly.