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Interrupt levels – FUJITSU ErgoPro m664 User Manual

Page 91

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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