Advantech PCM-3341 Series, Руководство пользователя

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27 Chapter 4
CMOS Data Backup
Because CMOS memory retention and integrity is especially critical for
normal startup, original CMOS memory values stored in the BIOS Flash
memory allow system boots to proceed normally. This is especially criti-
cal in unmanned applications where system monitoring is not convenient.
This data redundancy (backup) combined with error detecting capability
make for more stable and reliable systems.
Batteryless Bootup
Since the BIOS Flash memory does not need a battery to retain its con-
tents (unlike the CMOS's lithium memory backup), and usually has extra
capacity, CMOS memory values are stored here. So, in the event of
CMOS backup battery failure and CMOS configuration information
being erased, when the start-up routine encounters a CMOS memory
error during bootup, CMOS configuration memory is automatically trans-
ferred out of the BIOS Flash memory back into CMOS memory. Hence,
CMOS configuration information is replaced with the original memory
data and system bootup can then proceed normally. This would reset the
RTC, which is only a minor concern.
4.2 Award BIOS setup
Awardís BIOS ROM has a built-in Setup program that allows users to
modify the basic system configuration. This type of information is stored
in battery-backed CMOS RAM, so that it retains the Setup information
when the power is turned off.
Please note that all PCI functions are not supported in this product.
4.2.1 Entering setup
Power on the computer and press <Del> immediately. This will allow you
to enter Setup.