Common replacement power supply for amusement industry (video games)
Common replacement power supply for legacy industrial control platforms
Internal ball bearing fan
This 250 Watt AT power supply model SPI-250G is the typical power supply found in older computers that were turned on and off by a physical switch. Look in the graphic to the left, and you'll see this power supply has that switch. Lots of mission critical industrial applications still use AT power supplies for their power needs. Many arcade games and other ausement devices also require this type of power supply.
Note: Please be a smart shopper when buying this power supply. This power supply is not typical for today's computers and only required in very specific applications. Be sure that you need an AT power supply. It is not typical for one to need an AT power supply.
Below is an up close picture of the P8 and P9 connectors: