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In page RF modulator:
"Some systems were supplied with an external modulator unit that connected to both the system and to the antenna jacks of a television. One reason for this is that a device which outputs an RF signal must in general be certified by regulatory authorities—such as the U.S. Federal Communications Commission (FCC) — and thus by having an external RF modulator, only the modulator itself needed to be certified, rather than the entire video game system. One example was the Sup'R'Mod, designed for the Apple II.[citation needed]
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