Asus PRIME A320M-A Manual page 12

Serial port connector (10-1 pin COM)
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.
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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Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital
Interface (S/PDIF) port. Connect the S/PDIF Out module
cable to this connector, then install the module to a slot
opening at the back of the system chassis.
PCI Express 2.0 x1 slots
This motherboard has two PCI Express 2.0 x1 slots that support PCI Express x1
network cards, SCSI cards, and other cards that comply with the PCI Express
specifications.
PCI Express 3.0 / 2.0 x16 slot
This motherboard supports one PCI Express 3.0 / 2.0 x16 graphic card that
complies with the PCI Express specifications.
1-4
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 Front Panel Type item in the BIOS setup to [HD Audio]. 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 Audio].
PIN 1
SPDIF_OUT
Chapter 1: Product introduction