Asus P5B-E Optical S/PDIF Out port, Coaxial S/PDIF Out port, PS/2 keyboard port (purple)

13.Optical S/PDIF Out port. This port connects an external audio output device via an optical S/PDIF cable.

14.Coaxial S/PDIF Out port. This port connects an external audio output device via a coaxial S/PDIF cable.

15.PS/2 keyboard port (purple). This port is for a PS/2 keyboard.

ASUS P5B-E 2-25