MAINBOARD BIOS SETUP
BIOS, Driver & Utility Guide
16
DRAM modules are used, select
ECC
(Error Checking and Correcting) to correct 1
bit memory errors in the memory.
System BIOS Cacheable
- When Enabled, the contents of the F0000h system
memory segment can be cached to the Level-2 cache memory. The contents of the
F0000h memory segment are always copied from the BIOS ROM to system RAM
for faster execution and PCI compliance.
Video BIOS Cacheable
- When Enabled, C0000h to C7FFH become cacheable
memory.
Video RAM Cacheable
- Enabled will cause access to the video RAM addressed
at B0000H to BFFFH to be cacheable and also let the A0000H to AFFFFH to be a
UC memory type.
8 Bit I/O Recovery Time
- The recovery time is the length of time, measured in
ISA BUS clocks, that the system will delay after the completion of an input/output
request. This delay takes place because the CPU is operating faster than the
input/output bus. Therefore the CPU must be delayed to allow for the completion of
I/O transfers. This item allows you to determine the recovery time allowed for 8 bit
I/O. Choices are from NA, 1 to 8 ISA BUS clocks.
16 Bit I/O Recovery Time
- This item allows you to determine the recovery time
allowed for 16 bit I/O. Choices are from NA, 1 to 4 ISA BUS clocks.
Memory Hole At 15M-16M
- In order to improve compatibility, certain space in
memory can be reserved for old style ISA cards that map memory between 15M-
16M. Do not enable this feature unless you use the old style ISA card, otherwise
the memory size may be reduced to 15 MB for some O.S.
Passive Release
- The PIIX4 provides a programmable Passive Release mechanism
to meet the required master latencies. When enabled, ISA masters may see long
delays in access to any PCI memory, including the main DRAM array.
Delayed Transaction
- When enabled, the delay transaction mechanism will be in
effect when PIIX4 is the target of a PCI transaction.
AGP Aperture Size (MB) -
Select the size of the Accelerated Graphics Port
(AGP) aperture. The aperture is a portion of the PCI memory address range
dedicated for graphics memory address space. Host cycles that hit the aperture
range are forwarded to the AGP without any translation. See www.agpforum.org
for AGP information.
Options are 4, 8, 16, 32, 64, 128 and 256 MB.
