What are P8 and P9 connector?(What is, Concept and Definition)

Alternatively known as AT style connector , P8 connector and P9 connector , the P8 and P9 are power connectors from IBM.They connect the power supply to the motherboard on the AT, Baby AT and LPX motherboards.The image is an example of this connector.With the introduction of ATX, the motherboards base and power supplies have been replaced by the ATX style connector.

One of the most difficult and troublesome parts of this connector was the fact that both the P8 and P9 connectors looked identical.Although these connections were connected, they were replaced by the ATX style connector.

One of the most difficult and troublesome parts of this connector was the fact that both the P8 connector and the P9 looked identical.Although these connections were connected, it was still possible to put the P8 connector into the P9 port on the motherboard Or vice versa, which would physically damage the motherboard.When working with this style of connector, please make sure the black wires point to each other as shown in the picture below.

Finally, below are the pin descriptions for the P8 and P9 power connectors.

1	Orange	"Good Power"	P8-1
2	Red (XT without cable)	+ 5V DC	P8-2
3	Yellow	+ 12V DC	P8-3
4	Blue	-12V DC	P8-4
5	Black	Earth	P8-5
6	Black	Earth	P8-6
7	Black	Earth	P9-1
8	Black	Earth	P9-2
9	White	-5V DC	P9-3
10	Red	+ 5V DC	P9-4
11	Red	+ 5V DC	P9-5
12	Red	+ 5V DC	P9-6