Acorp 4S845AL User Manual

Acorp 4S845AL User Manual Manual pdf 60 page image

1 - 2 11 - 2 11 - 2 11 - 2 11 - 2 1Bhapter 1 BIOS SettpBhapter 1 BIOS SettpBhapter 1 BIOS SettpBhapter 1 BIOS SettpBhapter 1 BIOS SettpPCI / VGA Palette SnoopChoose Disabled or Enabled. Some graphic controllerswhich are not VGA compatible take the output from a VGAcontroller and map it to their display as a way to provideboot information and VGA compatibility.However, the color information coming from the VGAcontroller is drawn from the palette table inside the VGAcontroller to generate the proper colors, and the graphiccontroller needs to know what is in the palette of the VGAcontroller. To do this, the non-VGA graphic controllerwatches for the write access to the VGA palette andregisters the snoop data. In PCI based systems, the WriteAccess to the palette will not show up on the ISA bus if thePCI VGA controller responds to the Write.In this case, the PCI VGA controller should not respond tothe Write, it should only snoop the data and permit theaccess to be forwarded to the ISA bus. The non-VGA ISAgraphic controller can then snoop the data on the ISA bus.Unless you have the above situation, you should disablethis option.Disabled (default) Function Disabled.Enabled Function Enabled.Assign IRQ For USBLets the user choose which IRQ to assign for the USB.