ATX power supply with AT connector

[TechnicMasters]

Why some of my old ATX power supplys have one of the AT connectors? I cant use it to power AT boards i thing or is ir possible?

[Guest]

1 hour ago, TechnicMasters said:

Why some of my old ATX power supplys have one of the AT connectors? I cant use it to power AT boards i thing or is ir possible?

It's not an AT power connector.

 

But good for you for being old enough to remember what those AT connectors looked like. 

 

Before ATX12V came out and CPU voltage regulation moved to regulating the +12V, the six pin AUX connector would provide the additional +3.3V and +5V that the 20-pin wasn't robust enough to deliver.

 

https://pinouts.ru/Power/atxaux_pinout.shtml

 

[TechnicMasters]

Thank you. Ive found a picture of that kind of MB but ive never seen one before. Ive seen a lot of power supplys with that connector but ive never seen MB with it. Why? Were they uncommon?