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AIMB-250 Series
72 AIMB-250 Series User’s Manual
3.5.3.10 Memory Hole At 15M-16M
Enabling this feature reserves 15MB to 16MB memory address space to ISA expansion
cards that specifically require this setting. This makes the memory from 15MB and up
unavailable to the system. Expansion cards can only access memory up to 16MB.
The choice: Enable, Disable.
3.5.3.11 Delayed Transaction
This feature is used to meet the latency of PCI cycles to and from the ISA bus. The ISA bus
is much, much slower than the PCI bus. Thus, PCI cycles to and from the ISA bus take a
longer time to complete and this slows the PCI bus down.
However, enabling Delayed Transaction enables the chipset's embedded 32-bit posted
write buffer to support delayed transaction cycles. This means that transactions to and from
the ISA bus are buffered and the PCI bus can be freed to perform other transactions while
the ISA transaction is underway.
This option should be enabled for better performance and to meet PCI 2.1 specifications.
Disable it only if your PCI cards cannot work properly or if you are using an ISA card that is
not PCI 2.1 compliant.
The Choice: Enabled, Disabled.
3.5.3.12 Delay Prior to Thermal
When you system temperature higher, you can set the DRAM access time slowdown
between on 4 min – 32 min delay.
The choice: 4 Min, 8 Min, 16 Min, and 32 Min.
3.5.3.13 AGP Aperture Size (MB)
Select the size of 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.
The Choice: 4, 8, 16, 32, 64, 128, 256.
3.5.3.14 Init Display First
This item allows you to decide to active whether PCI Slot or Onboard/AGP first.
The choice: PCI Slot, Onboard/AGP.
3.5.3.15 On-Chip VGA
This item is enabled as the onboard VGA is used.
The Choices: Enabled, Disabled.
3.5.3.16 On-Chip Frame Buffer Size
This item is to select the amount of system memory that will be utilized as internal graphics
device memory
The choices: 1MB, 4MB, 8MB, 16MB, 32MB.