Chapter 3 – BIOS Setup Menus
3-5
Enabling cache increases CPU performance by holding data most re-
cently accessed in a special high-speed static RAM area called cache.
The AHIP6+ provides two levels of cache memory; level one is 16 K
internal to the Pentium processor, and level two, or external cache, is the
cache-on-a-stick site (COAST) which can accommodate 256 or 512 K of
high-speed cache memory.
Table 3-3. Memory Cache Submenu Options
Option
Description
Memory Cache
Controls the state of Pentium II memory cache.
Cache System BIOS Area
Allows the system BIOS memory area to be cached if enabled. Enabling also
increases system performance. The default is enabled and write protected.
Cache Video BIOS Area
Allows the video BIOS memory area to be cached if enabled. Enabling also
increases system performance. The default is enabled and write protected.
Cache 0 - 512K
Controls caching of 512K base memory. Default is Write Back Caching.
Cache 512K - 640K
Controls caching of 512K and 640K base memory. Default is Write Back Caching.
Cache Extended Memory Area
Controls caching of system memory above 1 MB. Default is Write Back Caching.
Cache Memory Region
Caches the corresponding memory when enabled. Memory in this area is
usually extended BIOS or AT-bus memory. Enabling cache may increase
system performance, depending on how the extended BIOS is accessed. The
default is disabled.
Shadow RAM Submenu
Xycom BIOS Setup Utility
Main
Item Specific Help
Shadow RAM [384 KB]*
Shadow CC00 – CFFF
[Disabled]
Shadow D000 - D3FF
[Disabled]
Shadow D400 - D7FF
[Disabled]
Shadow D800 - DBFF
[Disabled]
Shadow DC00 – DFFF
[Disabled]
Disabled – This block
is not shadowed.
Enabled – This block is
shadowed.
F1
Help
¯
Select Item
-/+
Change Values
F9
Setup Defaults
ESC
Exit
¨
Select Menu
Enter Select » Submenu
F10 Save & Exit
Figure 3-4. Shadow RAM Submenu
This menu allows you to enable or disable these memory segments.
Table 3-4. Shadow RAM Options
Option
Description
Shadow CC00 - CFFF
Shadow D000 – D3FF
Shadow D400 – D7FF
Shadow D800 - DBFF
Shadow DC00 - DFFF
These memory segments are enabled or disabled using this function.
Please note that each segment is 32K and that these segment ranges represent the first
four digits of the linear address range affected. For example, CC00-CFFF represents
the linear address range of CC000-CFFFF.
