appiah4 wrote:TheAbandonwareGuy wrote:appiah4 wrote:Two new old stock 230W AT PSUs for my U5SX-33 and future Pentium 100 builds. […]
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Two new old stock 230W AT PSUs for my U5SX-33 and future Pentium 100 builds.

This may be a stupid question but I genuinely have no idea despite owning several.
What is the reversed 3 pin port on AT PSUs used for?
Connecting a monitor so both turn on and off at the same time without using the monitor power button.
I feel old for having used that all the way until maybe 2000.
I did purchase a new AT PSU back in 2012, but the cooling fan's bearing went out, tried to lube the fan, and the PSU went out with a bang, I then purchased an ATX to AT adapter to use a modern ATX PSU in my 486 and K6-2 300 machine, and it worked great, and I didn't realize my K6-2 300 can use an ATX PSU (jumper-less configuration, just had to set the Power Supply type in the BIOS from K8/K9 to ATX), and I've been using an ATX PSU ever since (don't have to flip the switch to turn it off), but I like the flip switch (still have the flip switch on the computer).
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Systems from the Compaq Portable 1 to Ryzen 9 5950X
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