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Chapter 4
BIOS Configuration
Offboard PCI IDE Secondary IRQ
This option specifies the PCI interrupt used by the secondary IDE
channel on the offboard PCI IDE controller. The settings are Disabled,
Hardwired, INTA, INTB, INTC, or INTD. The Optimal and Fail-safe
settings are Disabled.
PCI Slot n IRQ Priority
These options specify the IRQ priority for PCI devices installed in the
PCI devices installed in the PCI expansion slots. The settings are Auto,
IRQ 3, 4, 5, 7, 9, 10, and 11, in priority order. The Optimal and Fail-safe
default settings are Auto.
DMA Channel n
These options allow you to specify the bus type used by each DMA
channel. The settings are PnP or ISA/EISA . The Optimal and Fail-safe
default settings are PnP.
IRQn
These options specify the bus that the specified IRQ line is used on.
These options allow you to reserve IRQs for legacy ISA adapter cards.
These options 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 pool, you can
use these options 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. IRQ12 only appears if the
Mouse Support option in Advanced Setup is set to Disabled. IRQ14 and
15 will not be available if the onboard PCI IDE is enabled. If all IRQs
are set to ISA/EISA and IRQ14 and 15 are allocated to the onboard
PCI IDE, IRQ9 will still be available for PCI and PnP devices, because
at least one IRQ must be available for PCI and PnP devices. The
settings are ISA/EISA or PCI/PnP. The Optimal and Fail-safe default
settings are PCI/PnP.
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