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Jumpers, Switches, and Connectors C-3
Table C-1. System-Board Jumper and Switch Settings
Jumper/Switch Setting Description
CLEAR CMOS
(default)
Settings in CMOS and the real-time clock (RTC)
are reset to factory defaults during reset.
Settings in CMOS and the RTC are retained during
reset.
CLEAR PASSWORD
(default)
Clears all passwords.
Retains all passwords.
RESERVED (default) Reserved (do not change).
BIOS RECOVERY (default) Normal BIOS boot operation.
Enables recovery mode for BIOS flash memory
(the BIOS WRITE jumper must also be in its
default position).
BOOT BLOCK PROTECT (default) The BIOS boot block is write-protected. Always
leave this jumper in this position.
The BIOS boot block is programmable. Do not use
this setting.
BIOS WRITE (default) Disables the BIOS update of flash memory.
Enables the BIOS update of flash memory.
NOTE: Only qualified technicians should change
this jumper because updating the BIOS requires a
special utility.