System Interrupt Levels - DEC DECpc 433 Service Manual

Device Mapping
Table D-3.
System Interrupt Levels
Interrupt Interrupt Interrupt
Priority
Controller Number Source
1 1
IRQO Timer tick
2
1
IR Qt Keyboard controller
1 IRQ2 Cascade interrupt
3
2
IRQ8 Real-time Clock (RTC)
d
2
IRQ9 Reserved
l
4
-~J~
5
2
IRQlO TIGAvideo
6 2
IRQll
SCSI interrupt
7
2 IRQ12 Mouse interrupt
8 2 IRQ13 Numeric coprocessor
9
2
IRQ14 Hard disk drive
10
2
IRQ15 Reserved
11
1
IRQ3 COM2
i2 1 IRQ4
COM!
13
1
IRQS
LAN interrupt
14 1
IRQ6
Floppy
disk drive
15 1 IRQ7
LPTl
D-4
DECpc 433 Workstation Service Guide