Dell Dimension C521 - Manual (Page 44)

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Power Supply DC Connector Pin Assignments
DC Power Connector P1
The real-time clock is being reset (jumpered temporarily).
jumpered unjumpered
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 +3.3 VDC Orange
3 GND Black
4 VCC (+5 V) Red
5 GND Black
6 VCC (+5 V) Red
7 GND Black
8 PS_PWRGOOD Gray
9 P5AUX Purple
10 V_12P0_DIG White
11 V_12P0_DIG White
12 +3.3 V Orange
13 +3.3 V Orange
14 -12 V* Blue
15 GND Black
16 PWR_PS_ON Green
17 GND Black
18 GND Black
19 GND Black
20 NC N/C
21 VCC (+5V) Red
22 VCC (+5V) Red