Method and apparatus for upgrading a data processing system from a single processor system to a multiprocessor system

摘要

A data processing system includes a first central processing unit (CPU) , at least one expansion port into which additional CPUs may be inserted, and a system controller. Interrupt circuitry coupled to said first CPU, said at least one expansion port, and said system controller, is configured to allow the dam processing system to operate as a multi- processor system, only one of the first and additional CPUs communicating with the system controller at any one time.