PC Specialist's Handbook ErgoPro m664-series
Edition 1 - Release 1 - March 1998 Page 9-9
Interrupt levels
Two programmable interrupt controllers supply interrupt control. The controllers are cascaded together as a
master-slave pair and provide 15 ISA-compatible interrupt levels. Excluding NMI, all interrupts can be masked.
Controllers are 8259A compatible.
The table below shows the interrupt level assignments.
Interrupt Function
NMI
Parity error (System memory does not have parity checking)
Master (Controller 1)
IRQ0
Timer output 0 (internal)
IRQ1
Keyboard controller
IRQ2
Interrupt from slave
IRQ3
COM2
IRQ4
COM1
IRQ5
Optional Creative Vibra 16XV audio (PnP ISA) by default
IRQ6
Diskette drive controller
IRQ7
LPT1
Slave (Controller 2)
IRQ8
Real-time Clock
IRQ9
IRQ10
IRQ11
IRQ12
PS/2-type mouse device
IRQ13
Math co-processor error
IRQ14
Primary IDE interface
IRQ15
Secondary IDE interface
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