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  1. A central processing unit ( CPU ), also called a central processor, main processor, or just processor, is the most important processor in a given computer. [1] [2] Its electronic circuitry executes instructions of a computer program, such as arithmetic, logic, controlling, and input/output (I/O) operations.

  2. History of general-purpose CPUs - Wikipedia. Contents. hide. (Top) 1950s: Early designs. 1960s: Computer revolution and CISC. 1970s: Microprocessor revolution. Early 1980s–1990s: Lessons of RISC. Mid-to-late 1980s: Exploiting instruction level parallelism. 1990 to today: Looking forward. VLIW and EPIC. Multi-threading. Multi-core. Intelligent RAM.