If you have a multi-meter you could measure all of the power supply voltages at the connector.
“All PC power supplies provide at least +5VDC, +12VDC, and -12VDC. Some power supplies also provide +3.3VDC, -5VDC, and/or 5VSB.
Remember that the wire color represents the voltage. Here is pic that shows the color and voltages on a common power supply connector.
https://i.sstatic.net/XfJWS.jpg
Ah, THAT is useful! I only knew about half of ‘em.
Note: Your link works in Chrome but not in Brave.
And I have at least 8 multimeters. :-) Some are specialized, like the Fluke 8060A’s get used mostly for audio work, but are also my most accurate meters.
