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When 5-micron semiconductors were commonplace, there was no such thing as an application-specific microprocessor (MPU). Boards were designed around a general-purpose central processing unit (CPU) and peripherals were added as external integrated circuits (ICs). As long as the instruction set remained the same, these CPUs could easily be swapped without affecting software developers. This allowed engineers to write code for next generation systems without worrying about the availability of silicon for new CPUs.
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