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Interrupts and ISA Bus Addresses 6–1
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 6–1 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#
1
Reserved
IRQ9 Available
IRQ10 Available
IRQ11 Available
IRQ12 Mouse