AMI BIOS Setup
3-19
PCI Latency Timer (clock)
This item controls how long each PCI device can hold the bus before another
takes over. When set to higher values, every PCI device can conduct
transactions for a longer time and thus improve the effective PCI bandwidth.
For better PCI performance, you should set the item to higher values. Settings
range from 32 to 248 at a 32 increment.
Primary Graphics Adapter
This item specifies which VGA card is your primary graphics adapter. Settings:
AGP
and
PCI
.
PCI Slot 1/6 IRQ, PCI Slot 2/5 IRQ, PCI Slot 3 & 4 IRQ Priority
These items specify the IRQ line for each PCI slot. Settings:
3, 4, 5, 7, 9, 10, 11
and
Auto
. Selecting
Auto
allows BIOS to automatically determine the IR line
for each PCI slot.
Set IRQs to PCI or ISA
Press <Enter> to enter the sub-menu and the following screen appears:
IRQ 3/4/5/7/9/10/11/14/15
These items specify the bus where the specified IRQ line is used.
The settings determine if AMIBIOS should remove an IRQ from the
pool of available IRQs passed to devices that are configurable by the
system BIOS. The available IRQ pool is determined by reading the
ESCD NVRAM. If more IRQs must be removed from the IRQ pool, the
end user can use these settings to reserve the IRQ by assigning an
ISA/EISA
setting to it. Onboard I/O is configured by AMIBIOS. All
IRQs used by onboard I/O are configured as
PCI/PnP
. If all IRQs are
set to ISA/EISA, and IRQ 14/15 are allocated to the onboard PCI IDE,
IRQ 9 will still be available for PCI and PnP devices. Available settings:
ISA/EISA
and
PCI/PnP
.
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