Cmos-To-Eeprom Backup (J27) - Motorola PATX3070 Series Installation And Use Manual

Hardware Preparation and Installation
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CMOS-to-EEPROM Backup (J27)

1-10
With the jumper removed from J9 (the factory configuration), the
CompactFlash device is in ''slave'' mode.
J9
1 2
CompactFlash in Master mode
You have the option to store, in EEPROM, a backup copy of the current
BIOS configuration (contained in CMOS RAM on the Intel 82371EB
PIIX4E PCI/ISA bridge device). J27 controls the CMOS-to-EEPROM
backup configuration. If the CMOS-to-EEPROM backup is enabled, the
BIOS configuration is copied to EEPROM each time the power-on self-
test (POST) executes.
The factory configuration has a jumper between J27 pins 2-3, so that a
fresh copy of the CMOS RAM contents is stored in EEPROM each time
you power up the system. If you move the jumper to J27 pins 1-2, the
CMOS-to-EEPROM backup is disabled.
J27
3
2
1
CMOS backup enabled
(factory configuration)
If the BIOS configuration data becomes corrupted while you are operating
the board with the CMOS-to-EEPROM backup enabled, you may need to
momentarily disable the backup, clear CMOS, and reconfigure the BIOS.
This is done as follows:
1. Turn off the power to the board.
J9
1
CompactFlash in Slave mode
(factory configuration)
J27
3
2
1
CMOS backup disabled
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