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System Interrupts
Sixteen levels of system interrupts are provided by the 80386 NMI as
weII as the VLSI-VL82C 100 that encloses the two 8259A Interrupt
Controller chips. The following shows the interrupt-level assignments,
decreasing priority:
Microprocessor NMI
Interrupt Controllers
CTLR1
Table 6-12: Interrupt Con trollers
22
Chapter 6: Appendix
Level
CTLR2
IRQ 0
IRQ 1
I R Q 2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
Function
Parity or I/O Channel Check
Timer Output 0
Keyboard (Output Buffer Full)
Interrupt from CTLR 2
Realtime Clock Interrupt
Software Redirected to INT OAH (IRQ2)
Reserved
Reserved
Reserved
Coprocessor
Fixed Disk Controller
Reserved
Serial Port 2
Serial Port 1
Parallel Port 2
Diskette Controller
Parallel Port 1
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