VIA Technologies EPIA-M840, Руководство пользователя

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Clear CMOS jumper
The onboard CMOS RAM stores system configuration data and
has an onboard battery power supply. To reset the CMOS settings,
set the jumper on pins 2 and 3 while the system is off. Return the
jumper to pins 1 and 2 afterwards. Setting the jumper while the
system is on will damage the mainboard. The default setting is on
pins 1 and 2.
Setting 1 2 3
Normal Operation (default) ON ON OFF
Clear CMOS setting OFF ON ON
Caution: Caution: Caution: Caution:
Except when clearing the RTC RAM, never remove the cap from
the CLEAR_CMOS jumper default position. Removing the cap
will cause system boot failure. Avoid clearing the CMOS while
the system is on; it will damage the mainboard.