AT Power Supply
The first common form factor is known as an AT power supply. Two features distinguish the AT power supply from its relative. An AT power supply has a mechanical switch used to control the availability of AC power.
The second feature that makes an AT power supply instantly recognizable has the power connectors for the motherboard, sometimes called a system board. An AT power supply has two power connectors for the motherboard - labeled P8 and P9.
Computer manufacturers faced one challenge when working with the AT power supply. Remember the fact that the AT power supply uses a mechanical switch to supply power. That makes it impossible to turn the computer on remotely. To accomplish remote power-on, a small redesign on the power supply was needed. That redesign is found in the ATX power supply.
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