Hardware Configuration and Specification

Memory Address Map

Memory Address

Size

Function

00000000-0009FFFF

640 KB

Base memory

000A0000-000BFFFF

128 KB

Video memory

000C0000-000CBFFF

40 KB

Video BIOS

000E0000-000FFFFF

128 KB

System BIOS

00100000-top limited

--

Extended (DIMM) memory

04000000-04000 FFF

4 KB

PCMCIA controller (slot 1)

04001000-04001 FFF

4 KB

PCMCIA controller (slot 2)

80100000-801000FF

256 B

Lucent Win Modem

80500000-805 FFFFF

1 MB

NetMagic VGA

80800000-80BFFFFF

3 MB

Neomagic VGA

81000000-81FFFFFF

16 MB

82100000-82100FFF

4 MB

FFFF0000-FFFFFFFF

64 KB

System board extension for

PnP BIOS

Interrupt Channel Assignment

Interrupt Channel

Function

NMI

System errors

IRQ0

System timer

IRQ1

Keyboard

IRQ2

Cascade

IRQ3

FIR or COM2

IRQ4

COM1

IRQ5

Audio or LPT2 (optional)

IRQ6

Floppy

IRQ7

LPT1

IRQ8

Real time clock

IRQ9

Card bus / ACPI or Modem/ VGA

IRQ10

USB

IRQ11

Free or COM1

IRQ12

PS2 pointing device

IRQ13

Numeric data processor

IRQ14

1st EIDE device (hard disk)

IRQ15

2nd EIDE device (CD-ROM drive)

DMA Channel Assignment

DMA Channel

Function

DRQO

Audio(optional)

DRQ1

ECP or Audio(optional)

DRQ2

Floppy

DRQS

ECP(optional)

DRQ4

DMA controller

DRQ5

Not used

DRQB

Not used

DRQ7

Not used

I/O Address Map

I/O Address

Function

OOO-OOF

DMA controller-1

O2O-O21

Interrupt controller-1

O4O-O4S

Timer 1

OBO, OB4

Keyboard controller 8742 chip select

OB1

System speaker out

O4OB

DMA controller-1

OB1

System speaker

O7O-O71

Real-time clock and NMI mask

OSO-OSF

DMA page register

OAO-OA1

Interrupt controller-2

0C0-0DF

DMA controller-2

OFO-OFF

Numeric data processor

120-13F, 1S0-1SF

Power management controller

170-177

2nd EIDE device (CD-ROM) select

1F0-1 F7

1st EIDE device (hard drive) select

22O-22F

Audio

24O-24F

Audio(optional)

27S-27F

Parallel port 3

2ES-2EF

LT Win modem or COM4(optional)

2FS-2FF

COM2 or LT Win modem(optional)

S7S, S7A

Parallel port 2

SBC-SBE

paraller port 1

I/O Address Map

I/O Address

Function

3B0-3BB, 3C0-3DF

Video Controller

3F0h-3F7

Standard Floppy Disk Controller

3E8-3EF

COM3 or LT Win modem(optional)

3F0-3F7

Floppy disk controller

3F8-3FF

COM1 or LT Win modem(optional)

480-48F, 4D6

DMA controller-1

4D0-4D1, CF8-CFF

PCI configuration register

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