Abit CX6, User Manual

Page: 71 / 114

Introduction of the BIOS 3-37
User’s Manual
PIRQ_0~PIRQ3:
Eleven options are available: Auto, 3, 4, 5, 7, 9, 10, 11, 12, 14, 15. Default setting is Auto.
This item allows the system to automatically specify the IRQ number for the device installed
on PCI slots. Which means, the system can specify the fixed IRQ number for the device
installed on the PCI slots (PCI slot 1 to PCI slot 5). This is a useful function when you want
to fix the IRQ for a specific device.
For example, if you want to move your hard disk to another computer and don’t want to
re-install Windows
®
NT, then you can specify the IRQ for the device installed on the new
computer to fit the original computer settings.
Note
If you specify the IRQ in this item, then you cannot specify the same IRQ to the ISA
bus, otherwise, it will cause a hardware conflict.
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 810 chipset),
INT# (means PCI slot IRQ signals) and devices, please refer to the table below:
Signals PCI slot 1
AGP Slot PCI slot 2 PCI slot 3 PCI slot 4 PCI slot 5
PIRQ_0 INT A INT B INT C INT D INT D
PIRQ_1 INT B INT C INT D INT A INT A
PIRQ_2 INT C INT D INT A INT B INT B
PIRQ_3 INT D INT A INT B INT C INT C
# 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.