1623. PC Speaker signal Input connector: SPKIN 1SPKIN 124. SPDIF (Sony / Philips Digital Interface) Input / Output Connectors: SPDIFIN 1 /SPDIFOUTSPDIFIN 1 SPDIFOUTSPDIFOUT+5VGNDSPDIFIN GND25. Optical kit connector: JP9This connector is for user that has Optical kit(optional) to provide other set of SPDIFINPUT and SPDIF OUTPUT function.Optical kit ConnectorJP912910Chapter 3AWARD BIOS SETUPThis mainboard has previously set to its best stable status. If you are not an experienced user,please do not change the default setting. When you are encounter any problem, please choice“LOAD STANDARD DEFAULTS” to restore best setting.