at power supply A unit (PSU) is the component that supplies power to the other components in a computer. This device is designed to convert general-purpose alternating current (AC) to low-voltage DC power for the internal components of the computer. AT delivers +5 V, +12 V, -5 V and -12 V voltages using two six-pin connectors. A few newer boards used an additional for +3.3 V. There are three different AT Motherboard found in market: P8 AT , P9 AT and P10 AT . Below tables show each of AT Motherboard mentioned above.

P8 AT

PIN Name Color Description
1 PG Orange Power Good, +5 VDC (when all voltage has stabilized)
2 +5V Red +5 VDC (or n/c)
3 +12V Yellow +12 VDC
4 -12V Blue -12 VDC
5 GND Black Ground
6 GND Black Ground

P9 AT

PIN Name Color Description
1 GND Black Ground
2 GND Black Ground
3 -5V White or Yellow -5 VDC
4 +5V Red +5 VDC
5 +5V Red +5 VDC
6 +5V Red +5 VDC

P10 AT

PIN Name Color Description
1 GND Black Ground
2 GND Black Ground
3 GND Black Ground
4 3.3V Green +3.3 VDC
5 3.3V Green +3.3 VDC
6 3.3V Green +3.3 VDC


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