AMD A85X Chipset User Manual page 21

(7) Reset switch: RESET
This 2-pin header connects to the case-mounted reset switch for rebooting your
computer without having to turn off your power switch. See the figure below.
(8) Power switch: PWR BTN
This 2-pin header connects to the case-mounted power switch to power
ON/OFF the system.
(9) USB 2.0 Port Headers (9-pin): USB1/USB2
These USB 2.0 headers are used for connecting the additional USB 2.0 port
plugs. By attaching an option USB 2.0 cable, your can be provided with two
additional USB 2.0 plugs affixed to the back panel.
(10) USB 3.0 Port Headers (19-pin): USB3_2
This USB 3.0 header is used for connecting the additional USB 3.0 port plugs.
By attaching an optional USB 3.0 cable, your can be provided with two
additional USB 30 plugs affixed to the back panel.
Pin 1
PWRLED
Pin 1
SPEAK
Pin 1
20
Pin 1
16
JW_FP
2
Pin 1
12
10