Asus P5N32-E SLI Plus - Manual (Page 51)

ASUS P5N32-E SLI Plus 2-25
11. USB 2.0 ports 1 and 2, 3 and 4. These 4-pin Universal Serial Bus (USB)
ports are available for connecting USB 2.0 devices.
12. IEEE 1394a port. This 6-pin IEEE 1394a port provides high-speed
connectivity for audio/video devices, storage peripherals, PCs, or portable
devices.
13. Optical S/PDIF Out port. This port connects an external audio output device
via an optical S/PDIF cable.
14. PS/2 keyboard port (purple). This port is for a PS/2 keyboard.