APPENDIX E: INTERRUPT ASSIGNMENTS
LEVEL
TYPICAL INTERRUPT SOURCE
NMI
Parity, AT Channel Check
IRQ0
Interval Timer 1, Counter 0 Out
IRQ1
Keyboard Controller
IRQ2
Cascade Interrupts from IRQ8 to IRQ15
IRQ3
Serial Port 2
IRQ4
Serial Port 1
IRQ5
Parallel Port 2
IRQ6
Diskette Controller
IRQ7
Parallel Port 1
IRQ8
Real Time Clock
IRQ9
Expansion Bus Pin
IRQ10
Expansion Bus Pin
IRQ11
Expansion Bus Pin
IRQ12
Expansion Bus Pin
IRQ13
Coprocessor Error
IRQ14
Fixed Disk Drive Controller
IRQ15
Expansion Bus Pin
486MIS System Board User's Manual Page 59