GOOD NEWS!!!
I walked by the rack chassis this board fits into.
I thought I had a motherboard in it, but it became aparent I did not.
The 6x6 power supply is *mostly* the same, but I did take a couple important images: https://imgur.com/a/ZIzfRYH
#1 gives you jumper info
#2 shows the different power connections than what I had posted. So it does NOT take a pair of AT power supplies. it does use the 2nd connection as a 3.3v input.
As for which one is which.... the connectors are keyed, so I got my motherboard out and.... i'm super glad I did because they pulled a sneaky on the 3.3v connection. its backwards to the normal AT connection. Also the AT connection looks like it is at the TOP (of your image) with the 3.3 at the bottom.
the 10-pin connections are the same, and are all 5v.
I know they make ATX to AT adapters that ALSO split out the 3.3v they are NOT common. https://www.bicker.de/en/x1-116_atx_at_adapte … nboards?nbnet=1# This particular adapter is wired to be always on, however...
It is a mistake to think you can solve any major problems just with potatoes.