JBAT1 and JCI1 are two commonly found jumpers on many motherboards. Here's what they are typically used for:

JBAT1 (Clear CMOS Jumper)

The JBAT1 jumper is used to clear the CMOS (Complementary Metal-Oxide Semiconductor) memory on the motherboard. The CMOS memory stores BIOS settings like the system time, hardware configuration, boot order, etc.

You may need to clear the CMOS in situations like:

• Troubleshooting a boot issue
• Resetting the BIOS if you forget the password
• The computer is not POSTing properly after a BIOS update or overclock

To clear the CMOS using JBAT1:

1. Shut down the PC and unplug the power cord
2. Locate the JBAT1 jumper on the motherboard (consult your manual if needed)
3. Move the jumper from the default position to the "Clear CMOS" position for a few seconds
4. Move the jumper back to the default position
5. Reconnect power and boot up the PC

The BIOS settings will now be reset to default values.

JCI1 (Chassis Intrusion Jumper)

The JCI1 jumper is related to the case intrusion detection feature found on some motherboards and computer cases. This is a simple security mechanism that can detect if the case has been opened.

If your case and motherboard support chassis intrusion detection, there will be a small switch on the edge of the case that gets triggered when the case is opened. This switch connects to the JCI1 jumper on the motherboard.

In the BIOS, you can configure the system to take certain actions if a chassis intrusion is detected, such as:

• Log a system event
• Notify the user on boot
• Require a password on boot
• Shut down or lock the system

So in summary - JBAT1 allows you to clear the CMOS settings, while JCI1 is related to case intrusion detection. Most users won't need to regularly interact with either of these jumpers unless they are troubleshooting or have specific security needs. Always refer to your motherboard manual for the exact location and usage of these jumpers as it can vary between models.