Asus M5A99FX PRO R2.0 Manual page 48

7. Front panel audio connector (10-1 pin AAFP)
This connector is for a chassis-mounted front panel audio I/O module that supports
either HD Audio or legacy AC`97 audio standard. Connect one end of the front panel
audio I/O module cable to this connector.
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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.
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We recommend that you connect a high-definition front panel audio module to this
connector to avail of the motherboard's high-definition audio capability.
If you want to connect a high-definition front panel audio module to this connector,
set the Azalia Front Panel item in the BIOS setup to [HD]; if you want to connect an
AC'97 front panel audio module to this connector, set the item to [AC97]. By default,
this connector is set to [HD].
Chapter 1: Product introduction