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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

AlphaPC 164LX I/O space assignments.

6.1 Interrupts

Table 6–1 lists each AlphaPC 164LX ISA interrupt and its source.

Table 6–1 ISA Interrupts

Interrupt Number Interrupt Source

IRQ0 Internal timer 1

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

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 81 82

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Compaq AlphaPC 164LX Manual do Utilizador Página 39