HP Vectra VEi8 HP Vectra VEi8, Technical Reference Manual (Product Description - Page 39

3 BIOS Overview BIOS Addresses Interrupt Controllers The Interrupt Requests (IRQ) are numbered sequentially, starting with the master controller, and followed by the slave. IRQ IRQ0 IRQ1 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 IRQ8 IRQ9 IRQ10 IRQ11 IRQ12 IRQ13 IRQ14 IRQ15 Interrupt Request Description System Timer Keyboard Controller If not used for serial port, available for PCI devices, ISA board, USB port, audio or video Used by serial port if enabled. If not, available for PCI devices, ISA board, USB port, audio or video If not used for parallel port, available for PCI devices, ISA board, USB port, audio or video Floppy Disk Controller LPT1 RTC Available for PCI devices, if not used by ISA board, USB port, audio or video Available for PCI devices, if not used by ISA board, USB port, audio or video Available for PCI devices, if not used by ISA board, USB port, audio or video Mouse Co-processor IDE Primary channel IDE Secondary channel. Free unless disabled PCI Interrupt Request Lines PCI devices generate interrupt requests using up to four PCI interrupt request lines (INTA#, INTB#, INTC#, and INTD#). PCI interrupts can be shared; several devices can use the same interrupt. However, optimal system performance is reached when minimizing the sharing of interrupts. 39