B. interrupt request lines (irq) – IBASE IB704 User Manual

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APPENDIX

IB704 User’s Manual

B. Interrupt Request Lines (IRQ)

Peripheral devices use interrupt request lines to notify CPU for the
service required. The following table shows the IRQ used by the devices
on board.

Level

Function

IRQ0

System Timer Output

IRQ1

Keyboard

IRQ2

PIC2 (IRQ8-15)

IRQ3

Serial Port #2

IRQ4

Serial Port #1

IRQ5

For PCI

IRQ6

Floppy Disk Controller

IRQ7

Parallel Port #1

IRQ8

Real Time Clock

IRQ9

For PCI

IRQ10

For PCI

IRQ11

For PCI

IRQ12

PS/2 Mouse

IRQ13

Coprocessor

IRQ14

Primary IDE