Chapter 1 Hardware Installation
23
Step 7 Attach Cables,
Continued
Connect Power Supply The power supply should match the physical configuration of the
chassis. Make sure that the power switch is Off before assembly. Before
attaching all components, make sure that the proper voltage has been
selected. Power supplies often can run on a wide range of voltages and must
be set (usually via a switch) to the proper range. Use at least a 300 watt power
supply, which should have built-in filters to suppress radiated emissions.
Attach the power supply cables to the power connector on the motherboard.
ATX-compatible power supplies have two 10-pin connectors. The power
connector pinout is:
Pin
Description
Pin
Description
11
+3.3V
1
+3.3V
12
-12V
2
+3.3V
13
Ground
3
Ground
14
-PWR_ON
4
+5V
15
Ground
5
Ground
16
Ground
6
+5V
17
Ground
7
Ground
18
-5V
8
PWR_GOOD
19
+5V
9
5V_VR
20
+5V
10
+12V
Keyboard Cable The keyboard attaches via a PS/2 keyboard connector, labeled PS2_KB. The
keyboard PS/2 keyboard connector pinout is:
Cont’d