Jumper; Clear Cmos Jumper: Jcmos1; At/Atx Select Jumper: Jatx1 - MSI MS-98H3 Manual

Hardware Setup

Jumper

Important
Avoid adjusting jumpers when the system is on; it will damage the motherboard.

Clear CMOS Jumper: JCMOS1

There is a CMOS RAM onboard that has a power supply from an external battery
to keep the data of system configuration. With the CMOS RAM, the system can
automatically boot OS every time it is turned on. If you want to clear the system
configuration, set the jumper to clear data.
Important
You can clear CMOS by shorting 2-3 pin while the system is off. Then return to
1-2 pin position. Avoid clearing the CMOS while the system is on; it will damage
the motherboard.

AT/ATX Select Jumper: JATX1

This jumper allows users to select between AT and ATX power.
2-12
1
Normal
1
ATX(Default)
1
Clear CMOS
1
AT