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Dari BIOS Survival Guide:
* Video Palette Snoop. Controls how a PCI graphics card can "snoop"
write cycles to an ISA video card's colour palette registers.
Snooping essentially means interfereing with a device. Only set to
Disabled if:
- An ISA card connects to a PCI graphics card through a VESA
connector
- The ISA card connects to a colour monitor, and The ISA card
uses the RAMDAC on the PCI card, and Palette Snooping (RAMDAC
shadowing) not operative on PCI card.
* PCI/VGA Palette Snoop. Alters the VGA palette setting while graphic
signals pass through the feature connector of PCI VGA card and are
processed by MPEG card. Enable if you have MPEG connections through
the VGA feature connector; this means you can adjust PCI/VGA
palettes. VGA snooping is used by multimedia video devices (e.g.
video capture boards) to look ahead at the video controller (VGA
device) to see what color palette is currently in use. It is only in
exceptional circumstances that you might ever need to enable this, so
disable for ordinary systems. (Award BIOS).
* Snoop Filter. Saves the need for multiple enquiries to the same
line if it was inquired previously. When enabled, cache snoop filters
ensure data integrity (cache coherency) while reducing the snoop
frequency to a minimum.
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