Intel DX79TO Technical Product Specification - Page 48
Signal Tables for the Connectors and Headers - 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 Analog Port 1 - left channel (microphone) 2 GND Ground 3 PORT_1R Analog Port 1 - right channel (microphone) 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 PORT_2R Analog Port 2 - right channel (headphone) 6 SENSE1_RETURN Jack detection return for front panel (JACK1) 7 SENSE_SEND Jack detection sense line from the Intel HD Audio CODEC jack detection resistor network 8 KEY No pin 9 PORT_2L Analog Port 2 - left channel (headphone) 10 SENSE2_RETURN Jack detection return for front panel (JACK2) Table 14. Front Panel Audio Header for AC '97 Audio Pin Signal Name Description 1 MIC Front panel microphone input signal (biased when supporting stereo microphone) 2 AUD_GND Ground used by analog audio circuits 3 MIC_BIAS 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 Right channel audio signal to front panel (headphone drive capable) 6 AUD_GND Ground used by analog audio circuits 7 RESERVED Reserved 8 KEY No pin 9 FP_OUT_L Left channel audio signal to front panel (headphone drive capable) 10 AUD_GND Ground used by analog audio circuits 48