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Chapter 3 BIOS Setup
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CPC-1814CLD5NA-N
IRQ Assignment Table
There are 15 interrupt sources of the system. Some are occupied by the system
devices. Only the ones that are not occupied can be distributed. The ISA devices
claim to engross the interrupt. Only the plug and play ISA devices can be distributed
by the BIOS or the OS. And several PCI devices share one interrupt through the
distribution of BIOS or OS. The diagram below shows parts of the interrupt
distribution under X86 platform, but it does not show the interrupt source occupied by
the PCI devices.
Level
Function
IRQ0 System
Timer
IRQ1
Standard 101/102 Key or Microsoft Keyboard
IRQ2
Programmable Interrupt Controller
IRQ3 COM#2
IRQ4 COM#1
IRQ5
Reserved for hot-swap
IRQ6
Standard FDD Controller
IRQ7 Reserved
IRQ8
System CMOS/Real Time Clock
IRQ9
Software Transfer to Int 0Ah
IRQ10 Reserved
IRQ11 Reserved
IRQ12 Mouse
Connector
IRQ13 Numeric
co-processor
IRQ14 Primary
IDE
IRQ15 Secondary
IDE