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Processor

80486SX/CX486S/80487SX/CX486S2/80486DX/80486DX2/Pentium Overdrive

Processor Speed

25/33/40/50(internal)/50/66(internal)MHz

Chip Set

ALI

Max. Onboard DRAM

128MB

Cache

32/64/128/256/512/1024KB

BIOS

AMI

Dimensions

312mm x 122mm

I/O Options

Floppy drive interface, IDE interface, parallel port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Keyboard connector

CN1

Serial port 1

CN9

Power LED & keylock

CN2

Serial port 2

CN10

Floppy drive interface

CN3

Speaker

JP1

IDE interface LED

CN4

Reset switch

JP2

Parallel port

CN5

IDE interface

JP3

PC/104 Module connector

CN6

Turbo switch

JP4

Keyboard port

CN7

Turbo LED

JP5

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

�

Battery type select external

JP11

pins 2 & 3 closed

Battery type select internal

JP11

pins 1 & 2 closed

�

Clock system select double frequency

JP15 & JP46

pins 1 & 2 closed

Clock system select single frequency

JP15 & JP46

pins 2 & 3 closed

�

CMOS memory normal operation

JP28

Open

CMOS memory clear

JP28

Closed

�

Parallel port interrupt select IRQ7

JP31

pins 1 & 2 closed

Parallel port interrupt select IRQ5

JP31

pins 2 & 3 closed

�

IDE interface enabled

JP32

pins 1 & 2 closed

IDE interface disabled

JP32

pins 2 & 3 closed

�

Parallel port address select 378h-37Fh

JP33

pins 1 & 2 closed

Parallel port address select 278h-27Fh

JP33

pins 2 & 3 closed

�

Floppy drive interface enabled

JP34

pins 1 & 2 closed

Floppy drive interface disabled

JP34

pins 2 & 3 closed

�

Monitor type select color

JP38

Closed

Monitor type select monochrome

JP38

Open

�

Parallel port unidirectional

JP39

Closed

Parallel port bidirectional

JP39

Open

�

XT IDE interface disabled

JP40

pins 2 & 3 closed

XT IDE interface enabled

JP40

pins 1 & 2 closed

�

Parallel port enabled

JP43

pins 1 & 2 closed

Parallel port disabled

JP43

pins 2 & 3 closed

SERIAL PORT CONFIGURATION

Port 1 (CN9)

Port 2 (CN10)

JP41

JP42

JP44

JP45

3F8h-3FFh

2F8h-2FFh

1 & 2

1 & 2

1 & 2

1 & 2

3F8h-3FFh

Disabled

1 & 2

1 & 2

N/A

2 & 3

Disabled

2F8h-2FFh

2 & 3

N/A

1 & 2

1 & 2

3E8h-3EFh

2E8h-2EFh

1 & 2

2 & 3

2 & 3

1 & 2

3E8h-3EFh

Disabled

1 & 2

2 & 3

N/A

2 & 3

Disabled

2E8h-2EFh

2 & 3

N/A

2 & 3

1 & 2

Disabled

Disabled

2 & 3

N/A

N/A

2 & 3

Note: Pins designated should be in the closed position.

SERIAL PORT INTERRUPT SELECT

Port 1 (CN9)

Port 2 (CN10)

JP29

JP30

IRQ4

IRQ3

pins 1 & 2 closed

pins 2 & 3 closed

IRQ3

IRQ4

pins 2 & 3 closed

pins 1 & 2 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

3MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

128MB

(4) 16M x 9

(4) 16M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

32KB

(4) 8K x 8

NONE

(1) 16K x 4

64KB

(4) 8K x 8

(4) 8K x 8

(1) 16K x 4

128KB

(4) 32K x 8

NONE

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

512KB

(4) 128K x 8

NONE

(1) 64K x 4

1MB

(4) 128K x 8

(4) 128K x 8

(1) 64K x 4

CACHE JUMPER CONFIGURATION

Size

JP22

32KB

Open

64KB

pins 9 & 10 closed

128KB

pins 7 & 8, 9 & 10 closed

256KB

pins 5 & 6, 7 & 8, 9 & 10 closed

512KB

pins 3 & 4, 5 & 6, 7 & 8, 9 & 10 closed

1MB

pins 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10 closed

CACHE JUMPER CONFIGURATION (CON�T)

Size

JP24

JP25

JP26

JP27

32KB

Open

Open

pins 2 & 3 closed

pins 1 & 2 closed

64KB

Open

Open

pins 1 & 2 closed

pins 1 & 2 closed

128KB

Open

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

256KB

Open

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

512KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

1MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP6

JP7

JP8

JP12

JP13

JP14

80486SX

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

80487SX

1 & 2

1 & 2

2 & 3

1 & 2

1 & 2

1 & 2

CX486S

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

2 & 3

CX486S2

2 & 3

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

80486DX/DX2

1 & 2

1 & 2

2 & 3

1 & 2

1 & 2

1 & 2

Overdrive

2 & 3

2 & 3

2 & 3

2 & 3

1 & 2

1 & 2

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CON�T)

Type

JP16

JP17

JP18

JP19

JP20

JP21

80486SX

Open

Open

Closed

Open

Open

Open

80487SX

1 & 2

Open

Closed

Open

Open

Closed

CX486S

3 & 4

Open

Open

Closed

Closed

Open

CX486S2

3 & 4

Closed

Open

Closed

Closed

Open

80486DX/DX2

2 & 3

Open

Closed

Open

Open

Closed

Overdrive

1 & 2

Closed

Closed

Open

Open

Closed

Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION (EXTERNAL)

Speed

JP23/1 & 2

JP23/3 & 4

JP23/5 & 6

JP23/7 & 8

25MHz

Open

Open

Open

Closed

33MHz

Closed

Open

Open

Open

40iMHz

Closed

Closed

Closed

Open

40MHz

Closed

Closed

Open

Open

50iMHz

Open

Closed

Open

Open

50MHz

Open

Open

Closed

Closed

66iMHz

Closed

Open

Closed

Open

Overdrive

Open

Closed

Closed

Open

CPU SPEED CONFIGURATION (INTERNAL)

Speed

JP9

JP10

40iMHz

pins 1 & 2 closed

pins 2 & 3 closed

50iMHz

pins 2 & 3 closed

pins 2 & 3 closed

66iMHz

pins 2 & 3 closed

pins 1 & 2 closed

WATCH DOG TIMER SETTING

Setting

JP35

Reset when WDT time out

pins 1 & 2 closed

Activate NMI to CPU when WDT time out

pins 2 & 3 closed

WDT disabled

Open

WATCH DOG TIME OUT PERIOD

Time out period

JP36

JP37

500ms

pins 1 & 2 closed

Closed

1 second

pins 1 & 2 closed

Open

2.5 seconds

pins 2 & 3 closed

Closed

5 seconds

pins 2 & 3 closed

Open