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The following tables list the factory-set statuses of the interrupt request levels (IRQ), DMA

channels, and I/O port addresses of the PC.

IRQ

Status

 

 

0

System timer

 

 

1

Keyboard

 

 

2

IRQ controller

 

 

3

Free

 

 

4

Serial port

 

 

5

Sound

 

 

6

Floppy disk

 

 

7

Parallel port

 

 

8

Real-time clock

 

 

9

Free

 

 

10

On-board LAN

 

 

11

Free or assigned to USB

 

 

12

Mouse

 

 

13

Floating-point processor

 

 

14

Primary IDE

 

 

15

Secondary IDE

 

 

*1 Because of PCI device, the allocated IRQ level may be changed.

DMA

Status

 

 

0

Free

 

 

1

Free

 

 

2

Floppy disk

 

 

3

Free

 

 

4

DMA controller

 

 

5

Free

 

 

6

Free

 

 

7

Free

 

 

I/O

Status

 

 

0200h to 0207h

Joystick

 

 

0330h to 0331h

MPU-401

 

 

0378h to 037Fh

Parallel port

 

 

03F8h to 03FFh

Serial port

 

 

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