Memory Shadow Sub-Menu; Figure 3-4. Memory Shadow Sub-Menu - HP VXI Pentium Series Hardware Installation And Configuration Manual

Memory Shadow
Sub-Menu
System Shadow:
Video Shadow:
Regions with Legacy
Expansion ROMs:
32 Using the BIOS Setup Utility
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The term "shadowing" refers to the technique of copying code, such as
BIOS extensions, from ROM into DRAM and accessing them from DRAM.
This allows the CPU to access the BIOS extensions faster and generally
increases system performance if many calls to the BIOS extensions are
made. The Memory Shadow Sub-Menu is shown below.
PhoenixBIOS Setup - Copyright 1985-95 Phoenix Technologies Ltd.
Main
Memory Shadow
System Shadow:
Video Shadow:
Regions with Legacy Expansion ROMs:
D000-D3FF:
D400-D7FF:
D800-DBFF:
DC00-DFFF:
↑ ↓ Select Item
F1 Help
← → Select Menu
ESC Exit

Figure 3-4. Memory Shadow Sub-Menu

This field is read-only (not editable) since the System BIOS is always
shadowed.
While it is advisable to leave video shadowing enabled, it is possible to
disable video shadowing for system performance reasons. The default is
Enabled.
These fields enable a ROM or disable shadowing for the associated memory
region. There are four 16 KB areas where expansion ROMs can be
shadowed:
D000 - D3FF
D400 - D7FF
D800 - DBFF
DC00 - DFFF
The default for each of these is ROM.
The shadow regions should be used only if an EXMbus card is installed in
the system that contains a BIOS extension (ROM), although there is no
effect on the system if a region is shadowed that does not contain a BIOS
extension. Note that each shadow region in the Setup menu is 16 KB in size.
Multiple shadow regions may have to be enabled if the BIOS extension to
be shadowed is larger than 16 KB.
Item Specific Help
Enabled <Tab>, <Shift-Tab>, or
<Enter> selects field.
[Enabled]
[Rom]
[Rom]
[Rom]
[Rom]
-/+ Change Values F9
Enter Select > Sub-Menu F10 Previous Values
Setup Defaults
Chapter 3