Apple IIe Card - Manual (Page 119)

The Macintosh LC has two serial ports on the back of the computer, one
marked with a picture of a printer and one marked with a picture of a
telephone. They are called the printer port and the modem port.
Modem port Printer port
Despite the names, you can plug any serial device into either port. The
Option Panel has two icons for Serial Cards (called Super Serial Cards in
the Apple IIe world), one representing whatever is plugged into the
modem port and the other representing whatever is plugged into the
printer port.
▲ s ▲ s
Important: In general, you shouldn’t use either Serial Card for your
printer, even if the printer is plugged into one of these ports. Instead,
use the Printer Card.
▲ s ▲ s
The changes you make to the settings for either Serial Card take effect
only if that card is installed in an active slot. Neither Serial Card is
installed in an active slot when you first install the Apple IIe Card
software.
❖ Note: The illustrations in this section show how to change settings in
the Serial Card for the modem port. The steps are exactly the same for
changing the settings in the Serial Card for the printer port.
❖
continues
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Setting the Serial Cards
Chapter 5: Reference 103