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IRQs, DMAs, and I/O Addresses Used by Your PC
1
IRQs used by PC
1
The IRQ, DMA, and I/O
address mappings shown here
are for a PC with a basic
configuration. The resources
used by your PC may vary,
depending upon which
accessory boards are bundled
with the PC. For information
on current usage of IRQs,
DMAs, and I/O addresses by
your PC, type MSD at the MS-
DOS prompt.
DMAs used by PC
I/O Addresses used by PC
IRQ0
system timer
IRQ1
keyboard
IRQ2
system cascade
IRQ3
free if not used for serial port
IRQ4
free if not used for serial port
IRQ5
free if not used for parallel port
IRQ6
flexible disk drive controller
IRQ7
free if not used for parallel port
IRQ8
real-time clock
IRQ9
available for PCI devices, if not used by ISA board
IRQ10
available for PCI devices, if not used by ISA board
IRQ11
available for PCI devices, if not used by ISA board
IRQ12
free if the mouse is disabled in SETUP
IRQ13
processor
IRQ14
integrated IDE hard disk drive controller
IRQ15
free if not used by second IDE controller
DMA 0
free
DMA 1
free if not used for parallel port in SETUP
DMA 2
flexible disk drive controller
DMA 3
free
DMA 4
used to cascade DMA channels 0-3
DMA 5
free
DMA 6
free
DMA 7
free
170h - 177h second IDE controller
1F0h - 1F7h integrated IDE hard disk controller
278h - 27Fh parallel port 2
2E8h - 2EFh serial port 4
2F8h - 2FFh serial port 2
3B0h - 3DFh integrated video graphics controller
376h - 377h second IDE controller
378h - 37Fh parallel port 1
3E8h - 3EFh serial port 3
3F0h - 3F7h integrated flexible disk controller
3F8h - 3FFh serial port 1
5 Technical Information
Specifications
English
85
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