IV. BIOS SOFTWARE

Graphics Aperture Size (64MB)

Memory-mapped, graphics data structures can reside in a Graphics Aperture. Leave on default setting.

Video Memory Cache Mode (UC)

USWC (uncacheable, speculative write combining) is a new cache technology for the video memory of the processor. It can greatly improve the display speed by caching the display data. You must leave this on the default setting of UC (uncacheable) if your display card cannot support this feature or else your system may not boot.

PCI 2.1 Support (Enabled)

This function allows you to enable or disable PCI 2.1 features including passive release and delayed transaction. Leave Enabled (default setting) for PCI 2.1 compliancy.

Memory Hole At 15M–16M (Disabled)

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 default is Disabled.

DRAM are xx bits wide

If all your DRAM modules have ECC chips (e.g., 8 chips + 1 ECC chips), they are considered 72bits and the following will be displayed:

If your DRAM modules do not have ECC chips (e.g. 8 chips), they are considered64 bits and the following will be displayed instead:Data Integrity Mode (Non-ECC)

Non-ECChas byte-wise write capability but no provision for protecting data integrity in the DRAM array. EC-Onlydata errors are detected but not corrected. ECC with hardware scrubbing allows a detection of single-bit and multiple-bit errors and recovery of single-bit errors. (See section III for more information on DRAM memory modules.)

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Onboard FDC Controller (Enabled)

When Enabled, this field allows you to connect your floppy disk drives to the onboard floppy disk drive connector instead of a separate controller card. If you want to use a different controller card to connect the floppy disk drives, set this field to Disabled.

Chipset Features

IV. BIOS

ASUS P2B User’s Manual

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