EPC-9 Hardware Reference
3
3
3-10
Cache Video BIOS Area
This option enables or disables caching of the VGA BIOS area in the 0C0000h
through 0C7FFFh region. The default is “Enabled ”.
Cache Memory Regions
These options enable or disable caching of the associated memory regions. When
BIOS extensions are present in these regions, enabling caching for that region
increases performance. The default is “Disabled ”.
Memory Shadow Sub-Menu
The term “ shadowing” refers to the technique of copying BIOS extensions from
ROM into DRAM and accessing them from DRAM. This allows the CPU to access
the BIOS extensions much more quickly and generally increases system performance
if many calls to the BIOS extensions are made. The Memory Shadow Sub-Menu is
shown below.
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
P ho e n ix B I OS S et u p - Co p y ri g h t 1 98 5 - 96 P ho e n ix Te c h no l o gi e s L t d.
I t e m S p ec i fi c He l p
F1 H e lp S e le c t I t e m - / + C h an g e V a l ue s F 9 S e tu p De f a ul t s
ES C E x it S e le c t M e n u E n te r Se l e ct Su b -M e n u F 1 0 P r ev i o us V al u e s
< T a b> , < S h if t - Ta b > , o r
< E n te r > s e le c t s f i el d .
M e m or y S h a do w
S y st e m S h ad o w : E n ab l e d
V i de o S h a do w : [ E n ab l e d]
Re g io n s w i t h L e ga c y E x pa n s io n RO M s:
D 00 0 - D3 F F : [ Di s ab l e d]
D C0 0 - DF F F : [ Di s ab l e d]
D 80 0 - DB F F : [ Di s ab l e d]
D 40 0 - D7 F F : [ Di s ab l e d]
Figure 3-5. Memory Shadow Sub-Menu.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com