Apple IIe Card - Manual (Page 121)

3. Click the button for the device you want to assign to this
Serial Card.
Clicking either of the top two buttons—Apple Data Modem 2400
or Apple Personal Modem 1200—automatically sets the Serial
Card parameters. If you click the Other Device button, the Port
Characteristics box in the lower portion of the panel becomes active.
Use this part of the panel to select the settings required by the device
you’re connecting. (See the manual that came with the device for the
appropriate settings.)
4. For each setting you want to change, position the pointer over
the small triangle to the right of the setting, and then press the
mouse button.
A pop-up menu of settings appears with the current setting
highlighted.
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Chapter 5: Reference 105