Gigabyte GA-8I945GMBX User Manual page 27

17) CLR_CMOS (Clear CMOS)
You may clear the CMOS data to its default values by this jumper. To clear CMOS, temporarily short
1-2 pin. Default doesn't include the "Shunter" to prevent from improper use this jumper.
18) CI (Chassis Intrusion, Case Open)
This 2-pin connector allows your system to detect if the chassis cover is removed. You can check the
"Case Opened" status in BIOS Setup.
Open: Normal
1
Short: Clear CMOS
1
Pin No.
1
1
2
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Definition
Signal
GND
Hardware Installation