Acer Altos G540 M2 Series User Manual page 28

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You may clear the CMOS data to its default values by this jumper.
Default value doesn't include the "Shunter" to prevent from improper use of
this jumper. To clear CMOS, temporarily short 2-3 pin.
Code
U82
USB1
U60
TPM
J3
J2
USB_3
PSMI1
SATA0
SATA1
SGPIO_JP2
SATA2
SGPIO_JP1
SATA3
SATA4
CLR_CMOS
1-2 close: Normal operation (Default setting)
2-3 close: Clear CMOS
Description
Intel® 5520 (North Bridge)
USB connector for internal USB (Tape
Device)
Intel ICH 10R (South Bridge)
TPM connector
SMBus connector for backplane board 2
SMBus connector for backplane board 1
USB connector for SSD
PSMI connector
SATA connector 0
SATA connector 1
SGPIO connector for backplane board 2
SATA connector 2
SGPIO connector for backplane board 1
SATA connector 3
SATA connector 4
Clear CMOS jumper
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