Following is a check-off list for the steps necessary to setup the PortDoubler on your Printer Port. There are some detailed instructions located just after the list.
1. Deactivate software that may be using the serial port (Refer to Chapter 5).
2. Connect the PortDoubler to the Mac's printer port.
3. Open the folder on your PortDoubler disk titled "Printer Port Install".
4. Drag the extension titled "Printer PortDoubler" and "PD Printers" onto your "System" folder.
* You should receive a confirmation from your mac, that the extensions will be placed automatically in your extensions folder.
5. Connect both of your printers to the PortDoubler. You can connect either printer to either of the PortDoubler's ports.
6. Open your "Chooser", click on the icon titled "Printer PortDoubler"
7. Select which port (1 or 2) you are configuring and what type of printer you are connecting from the menus available. Refer to examples below.
8. Restart your computer.
Port Menu
  The first menu is the "Port" menu, which tells the Port
Doubler which ports your devices are connected to.
The printer icons represent the Port Doubler's ports