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

AlphaPC 164SX I/O space assignments.

6.1 Interrupts

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

Table 6–1 ISA Interrupts
(Sheet 1 of 2)
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#1Reserved
IRQ9 Available
IRQ10 USB
IRQ11 Available
IRQ12 Mouse