A processing unit couples to a system bus in common with a peer processor, a main memory, in addition to other units, and includes a microprocessor which tightly couples to a local memory also accessible from such bus. The processing unit also includes an addressable electrically erasable programmable...http://www.google.com/patents/US5491790?utm_source=gb-gplus-sharePatent US5491790 - Power-on sequencing apparatus for initializing and testing a system processing unit
