Clear Rtc Ram (2-Pin Clrtc); Usb 2.0 Connectors (10-1 Pin Usb1112, Usb1314); Serial Port Connector (10-1 Pin Com); Digital Audio Connector (4-1 Pin Spdif_Out) - Asus PRIME Z270-K Manual

The speaker allows you to hear system beeps and warnings.
This connector is for the system power button.
This 2-pin connector is for the chassis-mounted reset button for system
reboot without turning off the system power.

Clear RTC RAM (2-pin CLRTC)

To erase the RTC RAM:

USB 2.0 connectors (10-1 pin USB1112, USB1314)

Serial port connector (10-1 pin COM)

opening at the back of the system chassis.

Digital audio connector (4-1 pin SPDIF_OUT)

the system chassis.
ASUS PRIME Z270-K
Del> key during the boot process and enter
reinstall the battery.
CLRTC
PIN 1
USB1112 USB1314
PIN 1 PIN 1
COM
PIN 1
SPDIF_OUT