User`s manual
A770 A2+/A740X A2+ 
15 
JUSB3/JUSB4: Headers for USB 2.0 Ports at Front Panel 
This header allows user to connect additional USB cable on the PC f ront panel, 
and also can be connected with internal USB devices, like USB card reader.
Pin 
Assignment 
1 +5V (fused) 
2 +5V (fused) 
3 USB- 
4 USB- 
5 USB+ 
6 USB+ 
7 Ground 
8 Ground 
9 Key 
1
2
9
10
USB3  USB4
10 NC 
JAUDIOF: Front Panel Audio Header 
This header allows user to connect the front audio output cable with the PC f ront 
panel. This header allows only HD audio front panel connector; AC’97 connector 
is not acceptable. 
Pin 
Assignment 
1  Mic Left in 
2 Ground 
3  Mic Right in 
4 GPIO 
5  Right line in 
6 Jack Sense 
7 Front Sense 
8 Key 
9  Left line in 
10 Jack Sense 
1
2
9
10










