User`s guide

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Hardware

Interrupts

IRQ no. Function

1 IRQ0

Internal timer, PIT A counter 0 output

1

lRQ1

I

Keyboard

1 IRQ2

I

Cascade for IRQ9

1 IRQ3

I

Serial port 2

1 IRQ4

1

Serial port 1

1 IRQ5

1

Available

I

IRQ6

1

Diskette drive controller

1 IRQ7

1

Parallel port 1

1 IRQ8

1

Real-time clock

1 IRQ9

1

Available

1 IRQ10 1 Reserved

1

IRQ11

1 Reserved

1 IRQ12 1 PS/2 mouse

IRQ13 Math coprocessor

IRQ14 Primary IDE controller

IRQ15 Secondary IDE controller

System I/O Address Map

Hex address Assigned device

DMA controller 1, 8237

Interrupt controller 1, 8259

Reserved

Timer, 8254

Keyboard controller, 8242PE

Real-time clock NMI (non-maskable interrupt)

DMA page register, 74LS612

Interrupt controller 2, 8259

DMA controller 2, 8237

Clear math coprocessor

Reset math coprocessor

000-01F

020-03F

022-024

040-05F

060-06F

070-07F

080-09F

0A0-0BF

0C0-0DF

0F0

OF1

A-12 Specifications