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Chapter 4: BIOS
These DMA channels control the data transfers between the I/O devices
and the system memory. The chipset allows the BIOS to choose which
channels to do the job. The settings are PnP or ISA/EISA.
IRQ3
IRQ4
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
IRQ14
IRQ15
These options specify which bus the specified IRQ line is used on and
allow you to reserve IRQs for legacy ISA adapter cards. If more IRQs
must be removed from the pool, the end user 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.
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, IRQ 9 will still be available for PCI and PnP devices. This is because at
least one IRQ must be available for PCI and PnP devices. The settings
are PCI/PnP or ISA/EISA. (See page 3-5 for information on shared
IRQs.)
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. The settings are C0000 , C4000 , C8000 ,
CC000 , D0000 , D4000 , D8000 or DC000 .
4-17
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