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J21: External Audio Connector
J21 is a 12-pin header that is used to connect to the optional audio cable
card that integrates jacks for Line In, Line Out and Mic.
Signal Name Pin # Pin # Signal Name
LINEOUT R 1 2 LINEOUT L
Ground 3 4 Ground
LINEIN R 5 6 LINEIN L
Ground 7 8 Ground
Mic-In 9 10 VREFOUT
Ground 11 12 Protect pin
J22: System Function Connector
J22 provides connectors for system indicators that provide light
indication of the computer activities and switches to change the
computer status. J22 is a 10-pin header that provides interfaces for
speaker, SMI, power button, reset switch and HDD LED.
Signal Name Pin Pin Signal Name
SP+ 1 2 SP-
Ground 3 4
EXT_SMI_SW
Ground 5 6 PWR_BTN
Ground 7 8 Reset
HDD LED+ 9 10 HDD LED-
J23: Wake On LAN Connector
J23 is a 3-pin header for the Wake On LAN function. Wake On LAN
will function properly only with an ATX power supply with 5VSB that
has 200mA.
Pin # Signal Name
1 +5VSB
2 Ground
3 -PME
J24: Compact Flash Socket
MB890 User’s Manual 21