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The BIOS Setup Utility
System BIOS
The System BIOS Option allows you to Shadow, Shadow & Cache, or Disable
the BIOS Shadow on the system board.  Choosing SHADOWED copies the
system’s BIOS into RAM for faster execution.  Choosing SHADOWED &
CACHED caches the shadowed system BIOS for even higher performance.
This allows you to take advantage of the high-speed 32-bit bus and the 70
nanosecond RAM.  Use the <+/-> key to toggle between the options.
Video BIOS
The Video BIOS Option allows you to Shadow, Shadow & Cache, or Disable
the BIOS Shadow on the system board.  Choosing SHADOWED copies the
system’s video BIOS into RAM for faster execution.  Choosing SHADOWED
& CACHED caches the shadowed video BIOS for even higher performance.
Use the <+/-> key to toggle between the options.  The System BIOS Shadow
option must be set to SHADOW or SHADOW & CACHE before enabling the
Video BIOS Shadow options.
Option ROM
Some peripheral cards such as low-priced SCSI controllers and network
adapters which do not have their own BIOS require this feature.  Check the
documentation of your peripheral cards to see if they need this feature.