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Computer architecture (also called hardware architecture) refers to

the physical configuration, logical structure, formats, protocols, and operational sequences for processing data, controlling the configuration, and controlling the operations. Computer architecture may also include word lengths, instruction codes, and the interrelationships among the main parts of a computer or group of computers.[1]
[t]he functional composition of a system and its components, the interfaces between components, and interfaces with the external environment, including users and other systems.[2]


  1. ATIS Telecom Glossary 2007.
  2. OGIS Guide, Glossary (full-text).