Hi,
I have a Prosignia 486/66 mainboard. Long ago I have disassembled the case being quite big, throw away case, disassembled PSU, but do not throw away power cables. It was an ugly 240 Watt strange shaped power unit. But, I now want to power it on. Can anyone correct or agree with the connections? If the orientation is the same as 6 + 6 AT connector, the 7 + 5 connectors pinout might be like this:

1 ------ 2 ----- 3 ----- 4 ------ 5 ------ 6 ------- 7 ------0----- 1 ------- 2 ------ 3 ------ 4 ------ 5
Red --- Red --- Red -- Yellow -- Black --- Black ---- Black ----0---- Black ---- Blue -- Orange -- Red ---- White
+5 ---- +5 ---- +5 ---- -5 ---- Gnd ---- Gnd ----- Gnd -----0---- Gnd ----- -12 ---- +12 ---- +5 ---- Power OK

Red --> +5 Volt
Black --> Negative (Gnd)
Yellow --> -5 Volt (directly connected to EISA pin B5)
Blue --> -12 Volt (directly connected to EISA pin B7)
Orange --> +12 Volt (directly connected to EISA pins B9 and F9)
White --> Power OK

Latest note: Luckily, I have found -5, -12 and +12 Volt connections from EISA bus! Only Power OK left, but eventually, it is Power OK! 😀