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Interrupts and ISA Bus Addresses

6–1

Interrupts and ISA Bus Addresses

This section lists the system and I/O interrupt assignments. It also lists the physical
Alpha 164UX I/O space assignments.

6.1 Interrupts

Table 6–1 lists each Alpha 164UX ISA interrupt and its source.

Table 6–1 ISA Interrupts

(Sheet 1 of 2)

Interrupt Number Interrupt Source

IRQ0

Internal timer

IRQ1

Keyboard

IRQ2

Interrupt from controller 2

IRQ3

COM2

IRQ4

COM1

IRQ5

Available

IRQ6

Diskette (floppy)

IRQ7

Parallel port

IRQ8#

Reserved

IRQ9

Available

IRQ10

Available

IRQ11

Available

IRQ12

Mouse