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IRQ Mapping Table
IRQ0 System Timer
IRQ8
RTC clock
IRQ1 Keyboard
IRQ9 Available
IRQ2 Cascade to IRQ Controller IRQ10
AC’97 CODEC
IRQ3 COM2
IRQ11 Reserved
IRQ4 COM1
IRQ12 PS/2
mouse
IRQ5 USB
IRQ13 FPU
IRQ6 FDC
IRQ14 Primary
IDE
IRQ7 Printer
IRQ15 Secondary
IDE
DMA Channel Assignments
Channel
Function
0
Available
1
Available
2
Floppy disk (8-bit transfer)
3
Available
4
Cascade for DMA controller 1
5
Available
6
Available
7
Available