Setting up the print server with Windows is not difficult, just follow the steps in the booklet. Of course they forgot to add how to do this in a Mac. So here is what I did.
First make sure the printer works directly on the Mac using the USB cable. I downloaded the Gimp-Print 4.2.7 drivers and installed them on the Mac. I opened System Preferences: Print & Fax: Set up printers: Add. Then I selected IP Printing: LPD/LPR, and used the IP address of the printserver as its address, and "lp1" (the "l" is a lowercase "L") as the queue name. This "lp1" is the first printer on the printserver. On other printservers, it might be lpt1, or l1, pr1, q1 or something else. It's not always in the documentation. Finally, select the printer model, selecting the Gimp driver. That is all; hope it helps somebody else.

