HP Vectra VE4 User Manual page 93

IRQs, DMAs, and I/O Addresses Used
IRQs used by PC*
DMAs used
by PC*
I/O addresses
used by PC*
*The IRQ, DMA and I/O address mapping 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.
Vectra VE 4/xx User's Guide 5 Technical Information
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 integrated PCI devices, if not used by an
ISA board
IRQ10 available for integrated PCI devices, if not used by an
ISA board
IRQ11 available for integrated PCI devices, if not used by an
ISA board
IRQ12 mouse
IRQ13 processor
IRQ14 integrated IDE hard disk drive controller
IRQ15 available for integrated PCI devices, if not used by an
ISA board or 2nd 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 if not used for parallel port in Setup
DMA 4 used to cascade DMA channels 0-3
DMA 5 free
DMA 6 free
DMA 7 free
1F0h – 1F7h integrated IDE hard disk controller
278h – 27Fh parallel port (option 2)
2E8h – 2EFh serial port 4
2F8h – 2FFh serial port 2
3B0h – 3DFh integrated video graphics controller
378h – 37Fh parallel port (option 1)
3E8h – 3EFh serial port 3
3F0h – 3F7h integrated flexible disk controller
3F8h – 3FFh serial port 1
3BCh – 3BEh parallel port (option 3)
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