HP Vectra VE5 3 Series Technical Reference Manual page 54

4 Summary of the HP/Phoenix BIOS
BIOS Addresses
IRQ (Interrupt Vector)
IRQ0(08h)
IRQ1(09h)
IRQ2(0Ah) Slave IRQ
IRQ8(70h)
IRQ9(71h)
IRQ10(72h)
IRQ11(73h)
IRQ12(74h)
IRQ13(75h)
IRQ14(76h)
IRQ15(77h)
IRQ3(0Bh)
IRQ4(0Ch)
IRQ5(0Dh)
IRQ6(0Eh)
IRQ7(0Fh)
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.
None of the interrupt service routines (ISRs), for the above lines, directly
flush any of the cache memories.
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 multiple-function PCI device may use several INT lines. These devices will
require more than one system interrupt request line.
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Interrupt Request Description
System Timer
Keyboard Controller
Cascade connection from INTC2 (Interrupt Controller 2)
Real Time Clock
Available for accessory board (ISA/PCI)
SoundBlaster3, or Available for accessory board (ISA/PCI)
Available for accessory board (ISA/PCI)
Mouse, or ISA accessory board
Co-processor
IDE, or ISA accessory board
2nd IDE or ISA/PCI accessory board
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