The form, design, and implementation of CPUs have changed over time, but their fundamental operation remains almost unchanged. This role contrasts with that of external components, such as main memory and I/O circuitry, and specialized coprocessors such as graphics processing units (GPUs). Its electronic circuitry executes instructions of a computer program, such as arithmetic, logic, controlling, and input/output (I/O) operations. Bottom side of an Intel 80486DX2, showing its pinsĪ central processing unit ( CPU), also called a central processor or main processor, is the most important processor in a given computer.
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