Motherboard IO pins
Audio Pins :
The front panel audio header on an Intel® Desktop Board lets you connect to a front panel audio
module built into a system chassis. See the header pinout configuration below for connecting a chassis with Intel® High Definition Audio (Intel® HD Audio) or AC'97 (Audio Codec '97) audio.| Note | HD Audio headers are pin-compatible with AC'97 chassis and connectors. |
For HD audio front panel modules
| Pin | Signal | Description | Pin | Signal | 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) |
For AC97 front panel modules
| Pin | Signal | Description | Pin | Signal | Description |
| 1 | MIC | Front panel microphone input signal (biased when supporting stereo microphone) | 2 | AUD_GND | Ground used by analog |
| 3 | MIC_BIAS | Microphone power / extra MIC input for stereo microphone support | 4 | AUD_GND | Ground used by analog audio circuits |
| 5 | FP_OUT_R | Right channel audio signal to front panel (headphone drive capable) | 6 | FP_RETURN_R | Right channel audio signal return from front panel (when headphones unplugged) |
| 7 | AUD_5V | Filtered +5V used by analog audio circuits | 8 | KEY | No pin |
| 9 | FP_OUT_L | Left channel audio signal to front panel (headphone drive capable) | 10 | FP_RETURN_L | Left channel audio signal return from front panel (when headphones unplugged) |
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