# 1 = Never seen it, but the motherboard manual might give a little insight
# 2 = I have an old P 70Mhz that had that & the AT connectors. I didn't use that plug
# 3 = This is your standard ATX connector that every PC uses now-a-days.
If you have a link to the motherboard manual, I might be able to give you some more help.
Well, I'm not sure about the 10-pin connector
as for the middle connector, AT-style, that is an AUX connector, and is pretty easy to find on older ATX power supplies. It provide more +5v and +3.3v, with grounds, for the board. The 3rd connector is not a standard 20-pin; it is a 24-pin. As to whether it is an EPS12v standard 24-pin or not, it's impossible to say from the picture. From what little I could dig up on google, it would appear that it is not a standard EPS12v board, and requires a proprietary supply to function. Unless you're dead set on using this board, it'd probably be better to e-bay it and find something better http://www.houseofhelp.com/v3/showthread.php?t=26059
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