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4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GJ.07.xx)
PCI Interrupt Request Lines
(BIOS version: GJ.07.xx)
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 multiple-function PCI device may use several INT lines. These devices will
require more than one system interrupt request line.
1.
IRQ15 can be made available by disabling the secondary channel of the IDE
controller in the SETUP program.
2.
IRQ3 and IRQ4 can be made available by disabling the serial ports in the
SETUP program.
3.
If there is a need to use another IRQ for the sound card, the following
Interrupt Vectors can be used: IRQ2, IRQ7 and IRQ10.
4.
IRQ5 and IRQ7 can be made available by disabling the parallel ports in the
SETUP program.
IRQ12(74h) Mouse
IRQ13(75h) Pentium processor
IRQ14(76h) Integrated primary IDE hard disk controller
IRQ15(77h) Free, if not used by secondary channel of IDE controller
1
(CD-
ROM)
IRQ3(0Bh) Free, if not used used for serial port
2
IRQ4(0Ch) Free, if not used used for communications card or serial port
2
IRQ5(0Dh)
3
Free, if not used used for expansion card or parallel port
4
IRQ6(0Eh) Floppy disk drive controller
IRQ7(0Fh) Free, if not used used for parallel port
3