If you have an Industruino PROTO, you can connect an Arduino style servo to any GPIO pin, using the standard Arduino library.
With an INDIO, you could do the same using a pin on the 14-pin IDC expansion connector, but if you are already using that for Ethernet, it's difficult to access the few pins that are not in use. Maybe you could look at industrial type servos that work with RS485 input, that would work in combination with Ethernet.
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