| Pin | Signal | Pin | Signal | | :--- | :--- | :--- | :--- | | 1 | VCC (+5V) | 2 | VCC (+5V) | | 3 | USB_P0- | 4 | USB_P1- | | 5 | USB_P0+ | 6 | USB_P1+ | | 7 | GND | 8 | GND | | 9 | Key | 10 | NC |
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For an AC’97 chassis, you must change the setting in BIOS under Advanced > Onboard Devices > Front Panel Type to AC97 . Otherwise, your mic won’t work. 3.4 USB Headers (F_USB1 & F_USB2) Two 2x5 pin headers (pin 9 is missing as a key). Each supports two USB 2.0 ports. | Pin | Signal | Pin | Signal
| Pin | Intel HD Audio (Default) | AC’97 Legacy | | :--- | :--- | :--- | | 1 | MIC2_L | MIC_IN | | 2 | GND | GND | | 3 | MIC2_R | MIC_BIAS | | 4 | -ACZ_DET | GND | | 5 | LINE2_R | FP_OUT_R | | 6 | GND | GND | | 7 | SENSE_SEND | +5V_AUDIO | | 8 | KEY (No pin) | KEY (No pin) | | 9 | LINE2_L | FP_OUT_L | | 10 | GND | GND | Otherwise, your mic won’t work