Introducing the Notebook Computer Identifying Parts of the Computer Back View 28. Universal serial bus port (USB). 32. Serial port (COM1). Use this port for a serial mouse, modem, printer, or other serial device. 29. Parallel port (LPT1). Use this port for a parallel printer or other parallel device, or to connect the floppy disk drive externally. 33. External monitor port. 34. ac adapter jack. 30. Docking port. 31. PS/2 keyboard or PS/2 mouse port (supports Y adapter). Reference Guide 15