Intel G31 User Manual page 10

** If you intend to use a PSU with 20-pin and 4-pin power plugs, make sure that the 20-pin
power plug can provide at least 15A on +12V and the power supply unit has a minimum
power rating of 350W. The system may become unstable or may not boot up if the
power is inadequate.
(2) ATX 12V Power Connector (4-pin block) : ATX12V
This is a new defined 4-pins connector that usually comes with ATX Power Supply.
The ATX Power Supply which fully supports AM2 processor must including this
connector for support extra 12V voltage to maintain system power
consumption. Without this connector might cause system unstable
because the power supply can not provide sufficient current for
system.
(3) PS/2 Mouse & PS/2 Keyboard Connector: KB
The connectors are for PS/2 keyboard and PS/2 Mouse.
(4) USB Port connector: USB1, UL1
The connectors are 4-pin connectors that connect USB devices to the system board.
(5) LAN Port connector: UL1
This connector is standard RJ45 connector for Network.
The USBLAN1 support 10M/100M/1000M bps data transfer rate.
(6) Audio Line-In, Lin-Out, MIC, Surrback, Surround, GEN/LEF Connector:
SURROUND1
This Connector are 6 phone Jack for LINE-OUT, LINE-IN, MIC, Surrback, Surround,
GEN/LEF
Line-out : (GREEN)
Line-in : (BLUE)
MIC : (PINK)
Surround : (ORANGE)
CEN / LFE : (BLACKNESS) Audio output to speaker-Center/Subwoofer speaker out
Side Surround: (GRAY)
(7) Floppy drive Connector (34-pin block): FLOPPY
This connector supports the provided floppy drive ribbon
cable. After connecting the single plug end to
motherboard, connect the two plugs at other end to the
floppy drives.
Audio output to speaker
Audio input to sound chip
Microphone Connector
Audio output to speaker-Rear speaker out
Audio output to speaker-Side speaker out
PS/2
Mouse
COM
PS/2
Keyboard
8
LAN
VGA USB1 UL2
Line-IN
Surrback
Line-OUT
CEN/LFE
Surround
MIC-IN
FDD
Pin 1
Floppy Drive Connector