Asus P5A-B User Manual page 47

IV. BIOS SOFTWARE
I/O Recovery Time (2 BUSCLK)
Timing for ISA cards. Leave on default setting.
Graphics Aperture Size (64MB)
Memory-mapped, graphics data structures can reside in a Graphics Aperture. Leave
on default setting.
Force PCI_66 GAT Mode (Enabled)
Enabling this feature will flush the internal PCI/66 buffer before data transfer. Set-
ting this to Disabled may cause some AGP card stability problems.
Passive Release (Enabled)
This is a mechanism that allows concurrency of ISA/EISA cycles and CPU-to-PCI
cycles. When this feature is enabled, the TXC will be possible to re-arbitrate PCI
bus and allow the CPU to access PCI even when the PCEB has been granted the bus.
Delayed Transaction (Disabled)
If Enabled, this frees the PCI Bus during CPU accessing of 8-bit ISA cards which
normally consume about 50-60 PCI Clocks without PCI delayed transaction. If PCI
Bus Masters cannot use the PCI Bus, leave this on the default setting of Disabled for
some ISA cards that are not PCI 2.1 compliant.
Memory Hole At 15M-16M (Disabled)
Enabling this feature reserves 15MB-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 memory modules have ECC chips (e.g., 8 chips + 1 ECC chips), they are
considered 72bits and the following will be displayed:
If your memory modules do not have ECC chips (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 memory module 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 2. System Memory, section III for more infor-
mation on 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 drive connector instead of a separate controller card. If you want to use a differ-
ent controller card to connect the floppy disk drives, set this field to Disabled.
ASUS P5A-B User's Manual 47