TYAN TITAN TURBO ATX-2, Руководство пользователя

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Assign IRQ for VGA
For most PCI cards, you do not want your system to assign an IRQ to
the VGA. However, for some older PCI cards, you do. Enabling this
function allows the system to assign an IRQ to a graphic card.
OS select for DRAM > 64 MB
If you are using IBM OS/2, and more than 64MB of memory, you must
Enable this field.
Video BIOS Shadow
This function allows BIOS to “shadow” firmware–to copy it from
ROM into the system RAM. Once there, the CPU can read the
firmware through the 16-bit or 32-bit DRAM BUS. Firmware that is
not shadowed is read through the 8-bit X BUS. Shadowing improves
the performance of the system BIOS and ROM firmware for expan-
sion peripherals, but reduces the amount of high memory available for
loading device drivers. Rather than shadowing all the available memory
sections at once, you should Enable shadowing of each memory section
independently, to see how it affects performance.
BIOS