1. Click the desktop to start, open the control panel and select "Printers and Faxes" to open a window; 2. Select the purchased printer type and right-click "Properties"; 3. Click "Port" in the properties dialog box, generally select "LPT 1: printer port", and click OK to finish the port selection.

Usually, the port number of the parallel port integrated in the computer motherboard is LPT 1. If the parallel port is added by an additional parallel card, LPT3 or LPT2 should be selected. If you use a USB cable, you need to select the corresponding USB port. At the same time, every time you install the system, you will automatically create a USB port, such as USB00 1, USB002, etc. , one-to-one correspondence with USB ports on the computer.