PT-5IH
SYSTEM BOARD
AWARD BIOS SETUP
IRQ# / DMA# assigned to :
Legacy : The system BIOS will skip never assign this specified IRQ/DMA resource to PCI or
ISA
ISA PnP devices.
PCI/ISA : All items set to this value will make the specified IRQ/DMA have a chance to be
PnP
assigned to PCI or ISA PnP devices.
PCI IRQ Actived By :
This option tells the system board chipset the IRQ signals input is Level or Edge trigger.
PCI IDE IRQ Map To :
(for off-board PCI ICE cards)
PCI-AUTO : The BIOS will scan for PCI IDE devices and determine the location of the PCI IDE
device, then assign IRQ 14 for primary IDE INT#, and assign IRQ 15 for secondary
IDE INT#.
PCI-SLOT1 : For the specified slot, the BIOS will assign IRQ 14 for primary IDE INT#, and assign
to
IRQ 15 for secondary IDE INT#.
PCI-SLOT4
ISA
: The BIOS will not assign any IRQs even if PCI IDE card is found. Because some
IDE cards connect the IRQ 14 and 15 directly from ISA slot thru a card. (This card
is called Legacy Header)
Note : No matter the item "Resources Controlled By" is set to "Manual" or "Auto", the system
BIOS assign IRQs to PCI devices from high to low. For ISA PnP devices, the sequence is
from low to high. IRQ 12 is always the last one available for PCI/PnP due to IRQ 12 is
always reserves for the PS/2 mouse.
Explanation for proper nouns :
PnP device :
Device that has Plug & Play compatibility. That means it can request for DMA, IRQ, I/O and
Memory from the PnP BIOS and all these requests can be relocatable. In other words, these
devices does not utilized any fixed resources.
All PCI devices and all ISA PnP devices are PnP Devices.
Legacy device :
A legacy device is a device that all its resources are fixed by hardware (or selected by jumpers).
All ISA Non-PnP devices are legacy device.
Extended System Configuration Data (ESCD) :
A media between the user and the system BIOS for passing the legacy devices informations.
These informations are stored into the onboard NVRAM (flash ROM).
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