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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0001:  Power Supplies - System Board
      9  IV  Power Supply Form Factors

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IV  Power Supply Form Factors
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ATX Power Supply
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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.

Figure 19: Understanding the Connections. I is power for a 3.5” floppy drive and II is power for a 3.5” hard drive. III is the mechanical switch. Two connections for power with the AT motherboard are P8 indicated with IV, with P9 designated by V.

 


P8 & P9 Grounds

When connecting the power supply to the motherboard, make sure the black ground leads are side by side. This insures P8 & P9 are properly arranged.


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.

AT is not ATX

Since the AT and ATX designs have different power connectors and case configuration they are not interchangeable.



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