Device Mapping
Interrupt Map
The IRQ assignments for the Digital AlphaStation 400 Series are shown in Table D-2.
This information is useful when adding or reconfiguring options on your system. Avoid
conflicts when assigning IRQs by associating one IRQ to one source. PCI interrupt levels
are set either by the operating system (as in the Windows NT operating system) or by the
SRM console (as in the OpenVMS and DEC OSF/1 operating systems).
Table D-2. System Interrupt Assignments
IRQ#
Source
0
Timer/counter
1
Keyboard
2
Internal cascade of 8259
3
Serial port 2 or ISA slot
4
Serial port 1 or ISA slot
5
Parallel port, PCI interrupt, or ISA slot
6
Floppy controller or ISA slot
7
Parallel port or ISA slot
8
Reserved
9
PCI interrupt or ISA slot
10
PCI interrupt or ISA slot
11
SCSI controller or ISA slot
12
Mouse or ISA slot
13
Reserved
14
ISA slot
15
PCI interrupt or ISA slot
D-2
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