Which type of power supply is considered obsolete and was the original for legacy computer systems?

The Advanced Technology (AT) power supply is recognized as obsolete and was originally used in older legacy computer systems. This type of power supply was a significant advancement during its time, as it provided the necessary power for the components of the computer. However, as technology evolved, newer standards emerged that offered better efficiency, more reliable connectors, and support for advanced features. The AT power supply was eventually replaced by the ATX standard, which introduced improvements in cooling system design, modularity, and overall electrical performance. The transition to more modern power supply types has rendered the AT power supply outdated, as current systems require higher levels of power and more complex power management capabilities that the AT design cannot provide. Understanding this context is crucial for identifying the development and shifts in power supply technology in computing systems over the years.