I/O Map

Table 40. I/O Map

Address (hex)

Size

Description

 

 

 

 

0000

- 000F

16 bytes

DMA controller

 

 

 

 

0020

- 0021

2 bytes

Programmable Interrupt Control (PIC)

 

 

 

 

0040

- 0043

4 bytes

System timer

 

 

 

 

0060

 

1 byte

Keyboard controller byte—reset IRQ

 

 

 

 

0061

 

1 byte

System speaker

 

 

 

 

0064

 

1 byte

Keyboard controller, CMD/STAT byte

 

 

 

 

0070

- 0071

2 bytes

System CMOS/Real Time Clock

 

 

 

 

0072

- 0073

2 bytes

System CMOS

 

 

 

 

0080

- 008F

16 bytes

DMA controller

 

 

 

 

0092

 

1 byte

Fast A20 and PIC

 

 

 

00A0 - 00A1

2 bytes

PIC

 

 

 

00B2 - 00B3

2 bytes

APM control

 

 

 

00C0 - 00DF

32 bytes

DMA

 

 

 

 

00F0

 

1 byte

Numeric data processor

 

 

 

 

0170

- 0177

8 bytes

Secondary IDE channel

 

 

 

 

01F0

- 01F7

8 bytes

Primary IDE channel

 

 

 

 

0228

- 022F (Note 1)

8 bytes

LPT3

 

 

 

 

0278

- 027F (Note 1)

8 bytes

LPT2

 

 

 

02E8 - 02EF (Note 1)

8 bytes

COM4/video (8514A)

 

 

 

02F8 - 02FF (Note 1)

8 bytes

COM2

 

 

 

 

0376

 

1 byte

Secondary IDE channel command port

 

 

 

0377, bits 6:0

7 bits

Secondary IDE channel status port

 

 

 

 

0378

- 037F

8 bytes

LPT1

 

 

 

03B0 - 03BB

12 bytes

Intel 82845 MCH

 

 

 

03C0 - 03DF

32 bytes

Intel 82845 MCH

 

 

 

03E8 - 03EF

8 bytes

COM3

 

 

 

03F0 - 03F5

6 bytes

Diskette channel 1

0370

- 0375

6 bytes

Diskette channel 2

 

 

 

 

03F6

 

1 byte

Primary IDE channel command port

 

 

 

 

03F8

- 03FF

8 bytes

COM1

 

 

 

04D0 - 04D1

2 bytes

Edge/level triggered PIC

 

 

 

LPTn + 400

8 bytes

ECP port, LPTn base address + 400h

 

 

 

0CF8 - 0CFB (Note 2)

4 bytes

PCI configuration address register

 

 

 

0CF9 (Note 3)

1 byte

Turbo and reset control register

 

 

 

0CFC - 0CFF

4 bytes

PCI configuration data register

 

 

 

FFA0 - FFA7

8 bytes

Primary bus master IDE registers

 

 

 

 

continued

90

Intel Server Board S845WD1-E Product Guide

Page 90
Image 90
Intel S845WD1-E manual O Map, Address hex Size Description