Add a db25 parallel port to your desktop or laptop pc through usb the icusb1284d25 6 ft usb to db25 parallel printer adapter cable turns an available usb port on a host pc into a db25 female parallel port allowing you to connect a db25 printer to the computer as if the necessary parallel port was built on a cost effective and reliable solution the usb to db25 adapter saves the expense of replacing a parallel printer for the sake of usb capability