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26 Chapter 1
IRQ Assignment Map
Interrupt Channel Function
NMI System errors
IRQ0 System timer
IRQ1 Keyboard
IRQ2 Cascade
IRQ3 COM2
IRQ4 COM1
IRQ5 VGA
IRQ6 Floppy
IRQ7 LPT1
IRQ8 Real time clock
IRQ9 PCMCIA (Optional)
IRQ10 USB
IRQ11 Audio/Modem/CardBus
IRQ12 PS2 pointing device
IRQ13 Numeric data processor
IRQ14 1st IDE device (hard disk)
2nd EIDE device (CD-ROM drive)
IRQ15 Optional
DMA Channel Assignment
DMA Channel Function
DRQ0 Audio (optional)
DRQ1 ECP or Audio (optional)
DRQ2 Floppy
DRQ3 ECP (optional)
DRQ4 DMA controller
DRQ5 Not used
DRQ6 Not used
DRQ7 Not used
505-1.book Page 26 Thursday, November 4, 1999 4:36 PM