Specifications

System BIOS and Resources
System Resources
Chapter 4 63
Interrupt Controllers
The system’s interrupt controller is equivalent in function to two 82C59
interrupt controllers. The following table shows how the interrupts are
connected to the APIC controller. The IRQs are numbered sequentially,
starting with the master controller and followed by the slave (both of
82C59 type).
82550 LAN A F
53C1010R A H
53C1010R B D
Zircon (All) H
Table 4-6 IRQ Routing Table
Device Interrupt ICH2 IRQ P64H IRQ
I/O APIC Input IRQ IRQ Description
INTIN0 ICH
INTIN1 IRQ1 Super I/O keyboard controller
INTIN2 IRQ0 ICH system timer
INTIN3 IRQ3 Super I/O - Used by serial port if enabled
INTIN4 IRQ4 Super I/O - Used by serial port if enabled
INTIN5 IRQ5 Free if not used for parallel port or audio
INTIN6 IRQ6 Super I/O - floppy disk controller
INTIN7 IRQ7 Super I/O - LPT1
INTIN8 IRQ8 ICH - RTC
INTIN9 IRQ9 Available for PCI devices
INTIN10 IRQ10 Available for PCI devices
INTIN11 IRQ11 Available for PCI devices
INTIN12 IRQ12 Super I/O - mouse
INTIN13 IRQ13 Coprocessor
INTIN14 IRQ14 ICH - Integrated IDE Controller
(primary)