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Chapter 3
BIOS Configuration
DMA Channel
n
These options allow you to specify the bus type used by each DMA channel.
The settings are PnP or ISA/EISA .
IRQ
n
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.
Reserved 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.
Reserved 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. This option does not appear if the Reserved Memory Size
option is set to Disabled. The settings are C0000, C4000, C8000, CC000, D0000,
D4000, D8000, or DC000.