Asus P2B User Manual page 45

Pentium ii motherboard
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IV. BIOS SETUP
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 expan-
sion 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 DIMMs have ECC (e.g., 8 chips + 1 ECC chip), they are considered 72bits
and the following will be displayed:
If your DIMMs do not have ECC (e.g. 8 chips), they are considered 64 bits and the
following will be displayed instead:
Data Integrity Mode (Non-ECC)
Non-ECC has byte-wise write capability but no provision for protecting data integrity in
the DRAM array. EC-Only data 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.)
....................................................................................................................................
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.
ASUS P2B User's Manual
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