Asus PRIME B660M-A D4 Manual page 15

16. Front panel audio header
This header is for a chassis-mounted front panel audio I/O module that
supports HD audio standard. Connect one end of the front panel audio I/O
module cable to this header.
• We recommend that you connect a high-definition front panel
audio module to this header to avail of the motherboard's high-
definition audio capability.
• If you want to connect a high-definition front panel audio module
to this header, set the Front Panel Type item in the BIOS Setup
to [HD Audio]. By default, this header is set to [HD Audio].
17. LPT header
The LPT (Line Printing Terminal) header supports devices such as
a printer. LPT standardizes as IEEE 1284, which is the parallel port
interface on IBM PC-compatible computers.
18. S/PDIF Out header
This header is for an additional Sony/Philips Digital Interface (S/PDIF) port.
Connect the S/PDIF Out module cable to this header, then install the module to
a slot opening at the back of the system chassis.
19. System Panel header
This header supports several chassis-mounted functions.
• System power LED (4-pin PLED)
This 4-pin header is for the system power LED. Connect the
chassis power LED cable to this header. The system power
LED lights up when you turn on the system power, and
blinks when the system is in sleep mode.
• Hard disk drive activity LED (2-pin HDD_LED)
This 2-pin header is for the HDD Activity LED. Connect the
HDD Activity LED cable to this header. The HDD LED lights
up or flashes when data is read from or written to the HDD.
• System warning speaker (4-pin SPEAKER)
This 4-pin header is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
• ATX power button/soft-off button (2-pin PWRSW)
This header is for the system power button. Pressing the power button turns the
system on or puts the system in sleep or soft-off mode depending on the operating
system settings. Pressing the power switch for more than four seconds while the
system is ON turns the system OFF.
• Reset button (2-pin RESET)
This 2-pin header is for the chassis-mounted reset button for system reboot without
turning off the system power.
PRIME B660M-A D4
AAFP
HD-audio-compliant
pin definition
PIN 1
SPDIF_OUT
1-5