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36 ASUS P2-99B User’s Manual
III. HARDWARE SETUP
Connectors
III. H/W SETUP
22. ATX Power Supply Connector (20-pin ATXPWR)
This connector connects to an ATX power supply. The plug from the power sup-
ply will only insert in one orientation because of the different hole sizes. Find the
proper orientation and push down firmly making sure that the pins are aligned.
IMPORTANT: Make sure that your ATX power supply can supply at least
10mA on the 5-volt standby lead (+5VSB). You may experience difficulty in
powering on your system if your power supply cannot support the load. For
Wake-On-LAN support, your ATX power supply must supply at least 720mA.
P2-99B ATX Power Connector
R
P2-99B
+3.3 Volts
-12.0 Volts
Ground
Power Supply On
Ground
Ground
Ground
-5.0 Volts
+5.0 Volts
+5.0 Volts
Power Good
+12.0 Volts
+3.3 Volts
+3.3 Volts
Ground
+5.0 Volts
Ground
+5.0 Volts
Ground
+5V Standby
23. AT Power Supply Connector (12-pin PS/2)
This connector connects to a standard 5 Volt power supply. To connect the leads
from the power supply, ensure first that the power supply is not plugged. Most
power supplies provide two plugs (P8 and P9), each containing six wires, two of
which are black. Orient the connectors so that the black wires are together.
P2-99B AT Power Connector
R
P2-99B
Power Plugs from
Power Supply
Power Connector
on Motherboard
P8
P9
ORG
RED
YLW
BLU
BLK
BLK
BLK
BLK
WHT
RED
RED
RED
+5V
PG
+12V
GND
+5V
-12V
-5V
Using a slight angle, align the plastic guide pins on the lead to their receptacles
on the connector. Once aligned, press the lead onto the connector until the lead
locks into place.