Abit BM6 User Manual page 41

BIOS Setup
Delay IDE Initial (Sec):
This item is used to support some old model or special type of hard disks or CD-ROMs,
since the BIOS may not detect those kinds of devices during system booting.
Video BIOS Shadow:
This option is used to define whether the BIOS on the video card uses the shadow feature or
not. You should set this option to Enabled, otherwise the display performance of the system
will greatly decrease.
Shadowing address ranges:
This option allows you to decide if the ROM BIOS area of an interface card at a specific
address uses the shadow feature or not. If you have no interface card using this memory
block, don't enable this option.
You have six address ranges you can select:
C8000-CBFFF Shadow, CC000-CFFFF Shadow, D0000-D3FFF Shadow, D4000-D7FFF
Shadow, D8000-DBFFF Shadow, DC000-DFFFF Shadow.
What is the SHADOW? The BIOS of standard video or interface cards is stored in
ROM, and it is often very slow. With the Shadow feature, the CPU reads the BIOS on
the VGA card and copies it into RAM. When the CPU runs this BIOS, the operation is
speeded up.
User's Manual
Computer Knowledge: SHADOW
3-15