Non Usb Printer In Osx


I've been given an elderly laser printer, but I'm having some trouble getting it to work under OS x. I know that the printer works. That isn't the issue for me.

The printer is a Gestetner Laser GLP400 Scout. It has Appletalk, Serial and Centronics/Parallel connections. My G3 iMac (OS 10.3.9) has USB! I have a parallel <-> USB cable. The system recognises that there is a device, but doesn't recognise they type of printer. It says that there is no driver installed and asks if I would like to search. I click OK. One time it told me that it found a driver and asked if I would like to open the browser. I clicked OK, but I couldn't find anything that happened.

What steps do I need to take now, please?