National Instruments MXI-2 Reference Manual page 42

Chapter 5 VXI-MXI-2 Configuration and Installation
instead of the user-modified settings. This is useful in the event that the
user-configured half of the EEPROM becomes corrupted in such a way that
the VXI-MXI-2 boots to an unusable state.
The Change Factory Configuration switch (switch 3 of U35) lets you
change the factory-default configuration settings by permitting writes to the
factory settings section of the EEPROM. This switch serves as a safety
measure and is not needed under normal circumstances. When this switch
is off (its default setting), the factory configuration of the EEPROM is
protected, so any writes to the factory area are ignored. The factory area
is protected regardless of the setting of switch 4 of U35.
Figure 5-9 shows the configuration settings for EEPROM operation. The
settings of switches 1 and 2 have no effect on EEPROM configuration.
© National Instruments Corporation 5-13 MXI-2 Configuration Reference Manual