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MegaRUM PCI Motherboard User’s Guide68
PCI/PnP Setup, Continued
IRQ3
IRQ4
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
IRQ12
IRQ14
IRQ15 These options specify the bus that the specified IRQ line uses. Use these
options to reserve IRQs for legacy ISA adapter cards. The setting determines if
AMIBIOS should remove an IRQ from the pool of available IRQs passed to
devices that can be configured by the system BIOS. The BIOS reads the ESCD
NVRAM to find all available IRQs. If more IRQs must be removed from the
pool, 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 PnP. IRQ12 only appears if the PS/2 Mouse Support option in
Advanced Setup is set to Disabled. IRQ14 and 15 are not available if the
onboard PCI IDE is enabled. If all IRQs are set to ISA and IRQ14 and 15 are
allocated to the onboard PCI IDE, IRQ9 is still available because at least one
IRQ must be available for PCI and PnP devices. The settings are ISA, Auto,
PnP, Primary PCI, or Secondry PCI. The Optimal and Fail-Safe default settings
are Auto.
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