Jbat1: Clear Cmos (Reset Bios) Jumper; Jcom1: Serial Port Connector - MSI B550M PRO-VDH WIFI Quick Start Manual

JBAT1: Clear CMOS (Reset BIOS) Jumper

There is CMOS memory onboard that is external powered from a battery located on
the motherboard to save system configuration data. If you want to clear the system
configuration, set the jumpers to clear the CMOS memory.
Resetting BIOS to default values
1. Power off the computer and unplug the power cord.
2. Use a jumper cap to short JBAT1 for about 5-10 seconds.
3. Remove the jumper cap from JBAT1.
4. Plug the power cord and Power on the computer.

JCOM1: Serial Port Connector

This connector allows you to connect the optional serial port with bracket.
24
Overview of Components
Keep Data
(default)
1 DCD
3 SOUT
5 Ground
7 RTS
9 RI
Clear CMOS/
Reset BIOS
2 10
1
9
2 SIN
4 DTR
6 DSR
8 CTS
10 No Pin