Air 486PH, User Manual, Page: 32 / 48

Video Shadow C000 & C400, 16K
When this option is set to Enabled , the video ROM code, that
normally mapped into memory address space from C0000h -
C7FFFh is copied (shadowed) from ROM to the system DRAM
for faster execution. This will significantly improve the display
performance of the system. The settings are Absent, No Shadow,
or Shadow. The Optimal default setting is
Enabled . The Fail-
Safe default setting is Disabled .
Shadow C800, 16K
Shadow CC00, 16K
Shadow D000, 16K
Shadow D400, 16K
Shadow D800, 16K
Shadow DC00, 16K
These options are to selectively shadow the ROM code on the
add-on cards, that mapped into the corresponding memory
address space, into the respectively system DRAM address
space, for faster execution. However, since some of add-on
cards may not work properly if their ROM code are shadowed,
care should be taken when select these option. The Optimal and
Fail-Safe default setting are
Disabled .
Palette Snooping
This option should be Enabled when running with a Multimedia
Video Processor Card. Once enabled, the address space of PCI
VGA Palette can be snooped, so Multimedia card may obtain
the color information from the Video Processor and overlay.
The Optimal and Fail-Safe default settings are
Disabled .