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CEC is an acronym for Central Electronics Complex. It "...contains the processors, memory, and I/O interfaces".[1]

Normally pronounced "keck", with a short "e", as in the combination of "kick" and "peck".

It may also be referred to as the "system unit", "processing unit", or "main tower".


  1. Chapter 2 - The PowerPC Processors, "Fortress Rochester: The Inside Story of the IBM iSeries" by Frank G. Soltis, 29th Street Press, 2001.