Asus P5B-E Plus User Manual page 48

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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.
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DO NOT insert a different connector to this port.
DO NOT unplug the external Serial ATA box when a RAID 0 or JBOD is
configured.
Chapter : Hardware information