DFI CA331-NR - Manual (Page 87)

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BIOS Setup
Memory Hole
In order to improve system performance, certain space in memory can be re-
served for ISA cards. This memory must be mapped into the memory space
below 16MB. When enabled, the CPU assumes the 15-16MB memory range is
allocated to the hidden ISA address range instead of the actual system DRAM.
When disabled, the CPU assumes the 15-16MB address range actually contains
DRAM memory. If more than 16MB of system memory is installed, this field must
be disabled to provide contiguous system memory.
Boots Graphic Adapter Priority
Selects which graphics controller to use as the primary boot device.
Internal Graphics Mode Select
Selects the amount of system memory used by the internal graphics device.
Max TOLUD
Selects the maximum value of TOLUD.
PEG Port
Sets the PEG port to Auto or Disabled.