Processor

CX486SX/80486SX/CX486DX/80486DX/80486DX2/ODP486SX

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

UMC

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo switch

J29

Turbo LED

J25

32-bit VESA Local bus slot

S1

Speaker

J26

32-bit VESA Local bus slot

S2

Power LED & keylock

J27

32-bit VESA Local bus slot

S3

Reset switch

J28

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CMOS memory normal operation

J2

pins 1 & 2 closed

CMOS memory clear

J2

pins 2 & 3 closed

»

On board battery enabled

J3

pins 1 & 2 closed

On board battery disabled

J3

pins 2 & 3 closed

»

Western Digital HDD (WDAC2340) not installed

J5

pins 1 & 2 closed

Western Digital HDD (WDAC2340) installed

J5

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 3

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 256K x 9

(4) 1M x 9

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

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

J7

J8

J9

J10

J11

J12

J15

J16

64KB

Open

2 & 3

Open

Open

Open

Open

1 & 2

1 & 2

128KB

2 & 3

1 & 2

Closed

Open

Closed

Open

1 & 2

2 & 3

256KB

1 & 2

2 & 3

Closed

Closed

Closed

Closed

2 & 3

2 & 3

Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

J20

SW1/switch 1

SW1/switch 2

SW1/switch 3

SW1/switch 4

20MHz

Closed

Off

Off

On

Off

25MHz

Open

On

On

Off

On

33MHz

Open

On

Off

On

On

40MHz

Open

Off

Off

On

Off

50i MHz

Open

On

On

Off

On

50MHz

Open

Off

Off

Off

Off

66i MHz

Open

On

Off

On

On

CPU TYPE CONFIGURATION

Type

J13

J14

J17

J18

J19

J20

J21

J24

J30

80486SX

1 & 2

Open

Open

Open

Open

N/A

Closed

1 & 2

2 & 3

CX486SX

2 & 3

Closed

1 & 2

Open

Open

Open

Closed

1 & 2

2 & 3

80486DX

1 & 2

Open

1 & 2

Closed

Closed

N/A

Open

1 & 2

2 & 3

CX486SX

2 & 3

Closed

1 & 2

Closed

Closed

Open

Open

1 & 2

2 & 3

ODP486SX

1 & 2

Open

1 & 2

Closed

Closed

N/A

Open

1 & 2

2 & 3

80486DX2

1 & 2

Open

1 & 2

Closed

Closed

N/A

Open

1 & 2

2 & 3

Note: Pins designated should be in the closed position.

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

J6

J22

J23

£ 33MHz

0 wait states

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

> 33MHz

1 wait state

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed