ATX to AT Power Supply converter cable. 
 
 
Converts 20-pin standard 
ATX connector to 
P8 and 
P9 AT standard power connectors. 
 
Features power on/off push-lock switch.  Switch attaches easily to cable with push-on spades as shown in picture.
 
The ATX connector is compatible with both 20P and 24P ATX Power Supply.
 
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ATX power connector (click to expand) | 
P8 power connector (click to expand) | 
P9 power connector (click to expand) |