Intel BOXDX79TO Product Specification - Page 48
Signal Tables for the Connectors and Headers - dx79to bios key
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Intel Desktop Board DX79TO Technical Product Specification 2.2.2.1 Signal Tables for the Connectors and Headers Table 13. Front Panel Audio Header for Intel HD Audio Pin Signal Name Description 1 PORT_1L 2 GND 3 PORT_1R 4 PRESENCE# 5 PORT_2R 6 SENSE1_RETURN 7 SENSE_SEND 8 KEY 9 PORT_2L 10 SENSE2_RETURN Analog Port 1 - left channel (microphone) Ground Analog Port 1 - right channel (microphone) Active low signal that signals BIOS that an Intel HD Audio dongle is connected to the analog header. PRESENCE#=0 when an Intel HD Audio dongle is connected Analog Port 2 - right channel (headphone) Jack detection return for front panel (JACK1) Jack detection sense line from the Intel HD Audio CODEC jack detection resistor network No pin Analog Port 2 - left channel (headphone) Jack detection return for front panel (JACK2) Table 14. Front Panel Audio Header for AC '97 Audio Pin Signal Name Description 1 MIC 2 AUD_GND 3 MIC_BIAS Front panel microphone input signal (biased when supporting stereo microphone) Ground used by analog audio circuits Microphone power/additional MIC input for stereo microphone support 4 PRESENCE# Active low signal that signals BIOS that an Intel HD Audio dongle is connected to the analog header. PRESENCE#=0 when an Intel HD Audio dongle is connected. 5 FP_OUT_R 6 AUD_GND 7 RESERVED 8 KEY 9 FP_OUT_L Right channel audio signal to front panel (headphone drive capable) Ground used by analog audio circuits Reserved No pin Left channel audio signal to front panel (headphone drive capable) 10 AUD_GND Ground used by analog audio circuits 48