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The origin of the names is FIO=Flexible, EIO=Expansion, CIO=Control, and MIO=Multiplexing, but those names don't always have true meaning.

This section is discussing flexible I/O.  That is, I/O that can be digital or analog, which is FIO and EIO.  CIO are digital only, and as digital I/O are identical to EIO.  See Section 2.8 (which is discussing all digital I/O not just flexible I/O) and Section 2.11.

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