A parallel port is a computer interface used to connect printers and other devices to the input/output (I/O) panel on the back of a motherboard. Some computers and motherboards no longer include a parallel port, as universal serial bus (USB) has replaced the parallel port.
Even if your computer doesn't have a parallel port, however, you can still connect a parallel printer to the system. A USB-to-parallel-port adaptor allows you to hook up a parallel-port printer to a USB port on your computer.
Connect one end of the printer cable to the parallel port on the rear of the printer.
Connect the other end of the printer cable to the parallel port on the adaptor.
Connect the USB connector on the end of the adaptor to the USB port on your computer.