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Apollo IV PCI Pentium ISA Motherboard User’s Guide
56
PCI/PnP Setup, Continued
IRQ3
IRQ4
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
IRQ12
IRQ14
IRQ15 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, the end user can use these options to
reserve the IRQ by assigning an ISA setting to it. Onboard I/O is configured
by AMIBIOS. All IRQs used by onboard I/O are configured as PCI, PnP, or
PCI/PnP. IRQ14 and 15 will not be available if the onboard Triton 2 PCI IDE
is enabled. If all IRQs are set to ISA 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, PnP, PCI/PnP, or PCI. The Optimal and Fail-Safe default
settings are:
Option Optimal Default Fail-Safe Default
IRQ3 PnP PCI/PnP
IRQ4 PnP PCI/PnP
IRQ5 PCI/PnP PCI/PnP
IRQ7 PnP PCI/PnP
IRQ9 PCI/PnP PCI/PnP
IRQ10 PCI/PnP PCI/PnP
IRQ11 PCI/PnP PCI/PnP
IRQ12 PnP PnP
IRQ14 PCI/PnP PCI/PnP
IRQ5 PCI/PnP PCI/PnP
DMA Channel 0
DMA Channel 1
DMA Channel 3
DMA Channel 5
DMA Channel 6
DMA Channel 7These options allow you to specify the bus type used by each DMA channel.
The settings are PnP or ISA. The Optimal and Fail-Safe default settings are
PnP.
Reserved ISA Card Memory Size This option specifies the size of the memory area reserved
for legacy ISA adapter cards. The settings are Disabled, 16K, 32K, or 64K.
The Optimal and Fail-Safe default settings are Disabled.
Reserved ISA Card Memory Address This option specifies the beginning address (in hex) of
the reserved memory area. The specified ROM memory area is reserved for
use by legacy ISA adapter cards.
The settings are C0000, C4000, C8000, CC000, D0000, D4000, D8000, or
DC000. The Optimal and Fail-Safe default settings are C4000.