This document discusses modern CPUs and how they can be extended. It describes CPU architecture and how it determines layout and features. Major manufacturers like Intel, AMD, and Freescale are profiled. Processors are compared based on speed, cache size, registers, and bus speed. Advanced topics covered include RISC, parallel processing, and symmetric/massively parallel configurations. The document also outlines standard computer ports and expansion technologies like serial/parallel, SCSI, USB, FireWire, expansion slots/cards, and PC cards that extend processing power. Plug and play capabilities are noted.