At / Atx Power Selection - Asus PE400D Series User Manual

4.

AT / ATX power selection

The AT_ATX_SEL jumper allows you to configure between AT or ATX
power mode. If the jumper is attached, ATX power mode is set, if the
jumper is removed, AT power mode will be set.
NOTE: The default setting for this jumper is set to ATX mode with a
jumper cap attached.
22 PE400D Series