HP Vectra VT 6/xxx HP Vectra XU 6/xxx and VT 6/xxx PCs - Technical Reference M - Page 41

PCI Interrupt Request Lines

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IRQ3(0Bh) IRQ4(0Ch) IRQ5(0Dh) IRQ6(0Eh) IRQ7(0Fh) Serial Port 2, Serial Port 4, or ISA accessory board Serial Port 1, Serial Port 3, or ISA accessory board SoundBlaster1, Parallel Port 2, or ISA accessory board Flexible Disk Controller SoundBlaster2, Parallel Port 1, or ISA accessory board Using the Setup program: • IRQ3 can be made available by disabling serial ports 2 and 4. • IRQ4 can be made available by disabling serial ports 1 and 3. • IRQ5 can be made available by disabling the parallel port 2. • IRQ7 can be made available by disabling parallel ports 1 and 2. • IRQ12 can be made available by disabling the mouse interrupt. PCI Interrupt Request Lines PCI devices generate interrupt requests using up to four PCI interrupt request lines (INTA#, INTB#, INTC#, and INTD#). When a PCI device makes an interrupt request, the request is re-directed to the system interrupt controller. The interrupt request will be re-directed to one of the IRQ lines made available for PCI devices. All PCI devices with interrupt transfer support will use and share INTA#.A PCI device supporting multiple functionalities may use several INT lines. These devices will require more than one system interrupt request line.

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IRQ3(0Bh)
Serial Port 2, Serial Port 4, or ISA accessory board
IRQ4(0Ch)
Serial Port 1, Serial Port 3, or ISA accessory board
IRQ5(0Dh)
SoundBlaster1, Parallel Port 2, or ISA accessory board
IRQ6(0Eh)
Flexible Disk Controller
IRQ7(0Fh)
SoundBlaster2, Parallel Port 1, or ISA accessory board
Using the
Setup
program:
•
IRQ3 can be made available by disabling serial ports 2 and 4.
•
IRQ4 can be made available by disabling serial ports 1 and 3.
•
IRQ5 can be made available by disabling the parallel port 2.
•
IRQ7 can be made available by disabling parallel ports 1 and 2.
•
IRQ12 can be made available by disabling the mouse interrupt.
PCI Interrupt Request Lines
PCI devices generate interrupt requests using up to four PCI interrupt request lines (INTA#,
INTB#, INTC#, and INTD#).
When a PCI device makes an interrupt request, the request is re-directed to the system interrupt
controller. The interrupt request will be re-directed to one of the IRQ lines made available for PCI
devices.
All PCI devices with interrupt transfer support will use and share INTA#.A PCI device supporting
multiple functionalities may use several INT lines. These devices will require more than one
system interrupt request line.