So I got a free Super7 Board but its a compaq, it uses this PSU

Mitac MPU-110REFP

AT Like headers but 3 of them, P1, P2 and P4, which I'm guessing P4 contains the power on switch ect. I want to use this board from a Presario 5280 with a K6-2 500 if I can, but figuring out the PSU I can get is a little troublesome, any ideas?