Using The Built-In Parallel Interface - Epson Stylus Pro 9500 Startup Manual

Using the built-in parallel interface

To use the printer's built-in parallel interface, you will need a
shielded, USB Conversion cable. Then follow the steps below to
connect the printer to your computer.
Note:
To connect the printer parallel port and USB port of your computer
using the USB cable, you will need an additional conversion cable.
1. Make sure both the printer and computer are turned off.
2. Plug the cable connector securely into the printer's interface.
Then squeeze the wire clips together until they lock into place
on both sides. If your cable has a ground wire, connect it to
the ground connector below the interface connector.
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Setting up the Printer with Your Macintosh