CA810 Motherboard Product Guide

I/O Map

Table 10. 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

CMOS Bank 1

 

 

 

 

 

0080

- 0090

 

DMA controller

 

 

 

 

 

0094

– 009F

 

DMA controller

 

 

 

 

 

00A0 - 00A1

2 bytes

PIC

 

 

 

 

 

00B2 - 00B3

2 bytes

APM control

 

 

 

 

 

00C0 - 00DE

31 bytes

DMA

 

 

 

 

 

00F0 – 00FF

 

Numeric data processor

 

 

 

 

 

0170

- 0177

8 bytes

Secondary IDE channel

 

 

 

 

 

01F0 - 01F7

8 bytes

Primary IDE channel

 

One of these ranges:

Can vary from 1 byte

Audio / game port

0200

– 0207

to 8 bytes

 

0208

– 020F

 

 

0210

– 0217

 

 

0218

– 021F

 

 

 

 

 

 

 

0220

- 022F

16 bytes

Audio (Sound Blaster Pro†-compatible)

0240

- 024F

16 bytes

Audio (Sound Blaster Pro-compatible)

 

0240

- 024F

16 bytes

Audio (Sound Blaster-compatible)

0278

- 027F*

8 bytes

LPT2

 

 

 

 

0228

- 022F*

8 bytes

LPT3

 

 

 

 

 

02E8 - 02EF*

8 bytes

COM4/video (8514A)

 

 

 

 

 

02F8 - 02FF*

8 bytes

COM2

 

 

 

 

 

One of these ranges:

8 bytes

MPU-401 (MIDI)

0320

- 0327

 

 

0330

- 0337

 

 

0340

- 0347

 

 

0350

- 0357

 

 

 

 

 

 

 

0376

 

1 byte

Secondary IDE channel command port

 

 

 

 

 

continued

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