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Intel

Advanced/RH Technical Product Specification

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Page 29

Appendix D

−−

I/O Map

Address (hex)

Size

Description

0000 - 000F

16 bytes

PIIX - DMA 1

0020 - 0021

2 bytes

PIIX - Interrupt

002E - 002F

2 bytes

Ultra I/O configuration

0040 - 0043

4 bytes

PIIX - Timer 1

0048 - 004B

4 bytes

PIIX - Timer 2

0060

1 byte

Keyboard Controller

0061

1 byte

PIIX - NMI, speaker

0064

1 byte

Kbd Controller,

0070, bit 7

1 bit

PIIX - Enable NMI

0070, bits 6:0

7 bits

PIIX - Real Time

0071

1 byte

PIIX - Real Time

0078

1 byte

Reserved - Brd.

0079

1 byte

Reserved - Brd.

0080 - 008F

16 bytes

PIIX - DMA Page

00A0 - 00A1

2 bytes

PIIX - Interrupt

00C0 - 00DE

31 bytes

PIIX - DMA 2

00F0

1 byte

Reset Numeric Error

0170 - 0177

8 bytes

Secondary IDE

01F0 - 01F7

8 bytes

Primary IDE Channel

0200 - 0207

8 bytes

Game Port

0220 - 022F

8 bytes

0278 - 027B

4 bytes

Parallel Port 2

02F8 - 02FF

8 bytes

On-Board Serial Port 2

0330 - 0331

1 bytes

MPU - 401 (MIDI)

0376

1 byte

Sec IDE Chan Cmd

0377

1 byte

Sec IDE Chan Stat

0378 - 037F

8 bytes

Parallel Port 1

Address (hex)

Size

Description

0388 - 038B

4 bytes

03B4 - 03B5

2 bytes

03BA

1 byte

03BC - 03BF

4 bytes

Parallel Port 3

03C0 - 03CA

12 bytes

03CC

1 byte

03CE - 03CF

2 bytes

03D4 - 03D5

2 bytes

03DA

1 byte

03E8 - 03EF

8 bytes

Serial Port 3

03F0 - 03F5

6 bytes

Floppy Channel

03F6

1 byte

Pri IDE Chan

03F7 (Write)

1 byte

Floppy Chan 1

03F7, bit 7

1 bit

Floppy Disk

03F7, bits 6:0

7 bits

Pri IDE Chan

03F8 - 03FF

8 bytes

On-Board Serial

LPT + 400h

8 bytes

ECP port, LPT

04D0 - 04D1

2 bytes

Edge/Level

0608 - 060B

4 bytes

0CF8*

4 bytes

PCI Config

0CF9

1 byte

Turbo & Reset

0CFC-0CFF

4 bytes

PCI Config Data

0FF0 - 0FF7

8 bytes

FF00 - FF07

8 bytes

IDE Bus Master

FFA0 - FFA7

8 bytes

IDE primary

FFA8 - FFAF

8 bytes

IDE secondary

Table D-1. Advanced/RH I/O Address Map

I/O Port 78 is reserved for BIOS use. Port 79 is a read only port, the bit definitions are shown below in Table D-2.

Bit #

Description

Bit = 1

Bit = 0

0

Reserved

n/a

n/a

1

Soft Off capable power supply present

No

Yes

2

Onboard Audio present

Yes

No

3

External CPU clock

Table B-2

Table B-2

4

External CPU clock

Table B-2

Table B-2

5

Setup Disable

Enable access

Disable access

6

Clear CMOS

Keep values

Clear values

7

Password Clear

Keep password

Clear password

Table D-2. Advanced/RH Port 79 Definition