Biostar P4TDH Bios Setup - Page 27

you should disable this option.

Page 27 highlights

P4TDH BIOS Setup In this case, the PCI VGA controller should not respond to the Write, it should only snoop the data and permit the access to be forwarded to the ISA bus. The non-VGA ISA graphic controller can then snoop the data on the ISA bus. Unless you have the above situation, you should disable this option. Disabled (default) Disables the function. Enabled Enables the function. 26

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P4TDH BIOS Setup
26
In this case, the PCI VGA controller should not respond to the Write, it should only snoop
the data and permit the access to be forwarded to the ISA bus.
The non-VGA ISA graphic
controller can then snoop the data on the ISA bus.
Unless you have the above situation,
you should disable this option.
Disabled
(default)
Disables the function.
Enabled
Enables the function.