Abit BF6 User Manual page 69

Introduction of the BIOS
This feature is for the operating system which will record and fix the PCI configuration
status, if you want to change it.
For the relations between the hardware layout of PIRQ (the signals from the PIIX4 chipset),
INT# (means PCI slot IRQ signals) and devices, please refer to the table below:
Signals PCI slot 1 PCI slot 2
AGP Slot
PIRQ_0 INT A INT B
PIRQ_1 INT B INT D
PIRQ_2 INT C INT C
PIRQ_3 INT D INT A
! Each PCI slot has four INT#s (INT A~INT D), and the AGP slot has two INT# (INTA and
INTB).
! USB used PIRQ_3.
! PCI slot 1 shares IRQ signals with the AGP slot.
! PCI slot 2 shares IRQ signals with the PCI slot 5
! PCI slot 3 shares IRQ signals with the PCI slot 6.
! PCI slot 4 shares IRQ signals with the USB controller.
! If you want to install two PCI cards into those PCI slots that share IRQ each other at
the same time, you have to make sure your OS and PCI devices' driver support IRQ
sharing.
! PCI slot 6 is fully bus slave. Thus you can't install a PCI card that needs to use bus
master signals into PCI slot 6. But you can install voodoo 1 or 2 that doesn't need to
use bus aster signals into PCI slot 6.
PCI slot 3 PCI slot 4 PCI slot 5
INT C INT D INT B
INT D INT A INT A
INT A INT B INT D
INT B INT C INT C
Note
3-41
PCI Slot 6
INT C
INT D
INT A
INT B
User's Manual