I still call it the AT or P8/P9 connector. There are ATX 20 pin to AT 12 pin w/ -5VDC and Dummy Load (3.3VDC) adapters to use modern PSUs in older systems.
https://en.wikipedia.org/wiki/AT_(form_ ... _connector
The PSUs have 2 Molex 90331 ports (female) and the motherboard has 2 Molex 15-48-0106 connectors (male pins). Remember: with those power supplies, you need to make sure the ground wires on Pins P8.5-P8.6 and P9.1-P9.2) meet each other, otherwise, you'll have a bad time (shorting or frying the board).
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Systems from the Compaq Portable 1 to Ryzen 9 5950X
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