CPU board.

CPU board. A circuit board that contains a microprocessor, or frequency determining circuitry for the microprocessor, the primary function of which is to execute user-provided programming, but not including:
(1) A circuit board that contains only a microprocessor intended to operate under the primary control or instruction of a microprocessor external to such a circuit board; or
(2) A circuit board that is a dedicated controller for a storage or input/output device.


47 CFR § 15.3

Scoping language

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