6

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 6–1lists 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#1

Reserved

 

IRQ9

Available

 

IRQ10

Available

 

IRQ11

Available

 

IRQ12

Mouse

 

Interrupts and ISA Bus Addresses 6–1

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Samsung 164BX Interrupts and ISA Bus Addresses, 1lists each Alpha 164UX ISA interrupt and its source, ISA Interrupts