Epson 400, 600, 640, EX, 700, 800, 850, 1520, 3000 User Manual page 9

1 Connect the adapter to an available USB port on the side of your iMac
as shown, or to a USB port on the back of your G3. If you're using a
USB hub, plug it into an available USB port on your iMac or G3, then
plug the adapter into a USB port on the hub. If you have more than one
hub, connect the adapter to the first hub.
USB port
USB/Parallel Adapter
OR
USB/Parallel Adapter
4
optional
USB hub