Power connectors
AT main power I
1 +5.0V DC (power good)
2 +5.0V DC (or n/c)
3 +12.0V DC
4 -12.0V DC
5 ground
6 ground
AT main power II
1 ground
2 ground
3 -5.0V DC
4 +5.0V DC
5 +5.0V DC
6 +5.0V DC

ATX main power
+3.3V DC 1 11 +3.3V DC sense
+3.3V DC 2 12 -12.0V DC
ground 3 13 ground
+5.0V DC 4 14 PS on
ground 5 15 ground
+5.0V DC 6 16 ground
ground 7 17 ground
Power OK 8 18 -5.0V DC
+5.0V SB 9 19 +5.0V DC
+12.0V DC 10 20 +5.0V DC

WTX 8pin ATX 20pin WTX 24pin