Asus M3A79-T Deluxe - Manual (Page 54)

2-28 Chapter 2: Hardware information
7. IEEE 1394a port connector (10-1 pin IE1394_2)
This connector is for a IEEE 1394a port. Connect the IEEE 1394a module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.
Never connect a USB cable to the IEEE 1394a connector. Doing so will damage
the motherboard!
You can connect the front panel 1394 cable to the ASUS Q-Connector (1394,
red) first, and then install the Q-Connector (1394) to the 1394 connector
onboard if your chassis supports front panel 1394 ports.
8. Serial port connector (10-1 pin COM1)
This connector is for a serial (COM) port. Connect the serial port module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.
The COM module is purchased separately.