Apple PowerBook (200 Series) - Manual (Page 39)

The PowerBook Duo Floppy Adapter
The PowerBook Duo Floppy Adapter allows you to connect an external 1.4
MB floppy disk drive (HDI-20) and up to three Apple Desktop Bus (ADB)
devices—such as a keyboard or mouse—to your computer.
Connecting a printer
The printer/modem port (´) on your PowerBook can accept either a
direct connection (to a printer such as a StyleWriter) or a network connection
(to a printer such as a LaserWriter). If you are connecting a printer to the
port, make sure that the modem selection in the Express Modem control
panel is set to Use External Modem. See the next section, “Connecting a
Modem,” for details.
31 Connecting Additional Equipment