Intel DZ77BH-55K - IEEE 1394 A Header; Front Panel Audio Header for Intel HD Audio; Front Panel Audio Header for AC 97 Audio; S;PDIF Header

Technical Reference
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2.2.2.1 Signal Tables for the Connectors and Headers
Table 16. IEEE 1394a Header
Pin Signal Name Pin Signal Name
1 Data A (positive) 2 Data A (negative)
3 Ground 4 Ground
5 Data B (positive) 6 Data B (negative)
7 +12 V DC 8 +12 V DC
9 Key (no pin) 10 Ground
Table 17. Front Panel Audio Header for Intel HD Audio
Pin Signal Name Pin Signal Name
1 [Port 1] Left channel 2 Ground
3 [Port 1] Right channel 4 PRESENCE# (Dongle present)
5 [Port 2] Right channel 6 [Port 1] SENSE_RETURN
7 SENSE_SEND (Jack detection) 8 Key (no pin)
9 [Port 2] Left channel 10 [Port 2] SENSE_RETURN
Table 18. Front Panel Audio Header for AC ’97 Audio
Pin Signal Name Pin Signal Name
1 MIC 2 AUD_GND
3 MIC_BIAS 4 PRESENCE#
5 FP_OUT_R 6 AUD_GND
7 No_Connect 8 KEY (no pin)
9 FP_OUT_L 10 AUD_GND
Table 19. S/PDIF Header
Pin Signal Name
1 Ground
2 S/PDIF out
3 Key (no pin)
4 +5 V DC