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Processor

80486SX/SL80486SX/CX486DX/AM486DX/80486DX/SL80486DX/80486DX2/ SL80486DX2/80486DX4

Processor Speed

20/25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz

Chip Set

SIS

Max. Onboard DRAM

64MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

250mm x 220mm

I/O Options

32-bit VESA local bus slots (3), green PC connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Keylock

J1

Green PC connector

JP74

Speaker

J2

Green PC connector

JP75

Turbo LED

J4

Turbo switch

S1

Reset switch

J5

32-bit VESA local bus slots

SL1 - SL3

Power LED

LED1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

�

Factory configured - do not alter

J9

Closed

�

Factory configured - do not alter

J11

Open

�

Factory configured - do not alter

J12

Open

�

CLK down by SMI control

JP10

pins 1 & 2 closed

CLK down by STPCLK control

JP10

pins 2 & 3 closed

�

Factory configured - do not alter

JP17

pins 1 & 2 closed

�

Factory configured - do not alter

JP20

pins 1 & 2 closed

Monitor type select monochrome/EGA/VGA

JP38

Open

Monitor type select CGA

JP38

Closed

�

CMOS memory normal operation

JP39

pins 1 & 2 closed

CMOS memory clear

JP39

pins 2 & 3 closed

�

Factory configured - do not alter

JP43

pins 2 & 3 closed

BIOS type select EPROM

JP73

pins 1 & 2 closed

BIOS type select flash

JP73

pins 2 & 3 closed

�

Factory configured - do not alter

JP78

pins 1 & 2 closed

�

Factory configured - do not alter

JP79

pins 2 & 3 closed

Turbo enabled

TBSW

pins 2 & 3 closed

Turbo disabled

TBSW

pins 1 & 2 closed

Note: The location of jumpers J9, J11, J12, JP10, JP17, JP39, JP43 and JP78 are unidentified.

DRAM CONFIGURATION 1

Size

Bank 0

Bank 1

Bank 2

2MB

NONE

(1) 256K x 36

(1) 256K x 36

4MB

NONE

(1) 512K x 36

(1) 512K x 36

8MB

NONE

(1) 1M x 36

(1) 1M x 36

12MB

NONE

(1) 1M x 36

(1) 2M x 36

16MB

NONE

(1) 2M x 36

(1) 2M x 36

24MB

NONE

(1) 2M x 36

(1) 4M x 36

32MB

NONE

(1) 4M x 36

(1) 4M x 36

36MB

NONE

(1) 1M x 36

(1) 8M x 36

48MB

NONE

(1) 4M x 36

(1) 8M x 36

64MB

NONE

(1) 8M x 36

(1) 8M x 36

DRAM CONFIGURATION 2

Size

Bank 0

Bank 1

Bank 2

1MB

(4) 256K x 9

NONE

NONE

4MB

(4) 1M x 9

NONE

NONE

16MB

(4) 4M x 9

NONE

NONE

64MB

(4) 16M x 9

NONE

NONE

DRAM CONFIGURATION 3

Size

Bank 0

Bank 1

Bank 2

8MB

(4) 1M x 9

NONE

(1) 1M x 36

20MB

(4) 1M x 9

NONE

(1) 4M x 36

32MB

(4) 4M x 9

NONE

(1) 4M x 36

DRAM CONFIGURATION 4

Size

Bank 0

Bank 1

Bank 2

6MB

(4) 1M x 9

(1) 256K x 36

(1) 256K x 36

8MB

(4) 1M x 9

(1) 512K x 36

(1) 512K x 36

12MB

(4) 1M x 9

(1) 1M x 36

(1) 1M x 36

24MB

(4) 4M x 9

(1) 1M x 36

(1) 1M x 36

48MB

(4) 4M x 9

(1) 4M x 36

(1) 4M x 36

DRAM JUMPER CONFIGURATION

Configuration

JP45

JP46

1

pins 1 & 2 closed

Open

2

pins 1 & 2 closed

Open

3

pins 1 & 2 closed

Open

4

Open

Closed

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

32KB

(4) 8K x 8

NONE

(1) 8K x 8

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB (A)

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

256KB (B)

(4) 64K x 8

NONE

(1) 32K x 8

Note: The orientation of Banks 0 & 1 and the TAG is unidentified.

CACHE JUMPER CONFIGURATION

Size

JP30

JP31

JP32

JP34

JP35

JP36

32KB

1 & 2

1 & 2

1 & 2

Open

1 & 2

1 & 2

64KB

2 & 3

1 & 2

1 & 2

1 & 2

2 & 3

1 & 2

128KB

2 & 3

2 & 3

1 & 2

2 & 3, 4 & 5

1 & 2

2 & 3

256KB (A)

2 & 3

2 & 3

2 & 3

1 & 2, 3 & 4

2 & 3

2 & 3

256KB (B)

2 & 3

2 & 3

2 & 3

2 & 3, 4 & 5

1 & 2

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

J13

JP8

JP12

JP13

JP18

JP19

JP24

80486SX

Closed

2 & 3

Open

Open

1 & 2

2 & 3

Open

SL80486SX

Closed

2 & 3

Open

Open

1 & 2

2 & 3

4 & 5

CX486DX

Open

2 & 3

2 & 3

2 & 3

2 & 3

1 & 2

2 & 3

AM486DX

Closed

2 & 3

Open

Open

1 & 2

2 & 3

Open

80486DX

Closed

2 & 3

Open

Open

1 & 2

2 & 3

Open

SL80486DX

Closed

2 & 3

Open

Open

1 & 2

2 & 3

4 & 5

80486DX2

Closed

2 & 3

Open

Open

1 & 2

2 & 3

Open

SL80486DX2

Closed

2 & 3

Open

Open

1 & 2

2 & 3

4 & 5

80486DX4

Closed

2 & 3

Open

Open

1 & 2

2 & 3

4 & 5

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CON�T)

Type

JP25

JP28

JP29

JP33

JP37

JP40

80486SX

Open

Open

Open

2 & 3

Open

2 & 3

SL80486SX

2 & 3

1 & 2

3 & 4

2 & 3

Open

2 & 3

CX486DX

1 & 2, 3 & 4

Open

2 & 3

1 & 2, 3 & 4

3 & 4

2 & 3

AM486DX

Open

Open

Open

1 & 2, 3 & 4

3 & 4

1 & 2

80486DX

Open

Open

Open

1 & 2, 3 & 4

3 & 4

2 & 3

SL80486DX

2 & 3

1 & 2

3 & 4

1 & 2, 3 & 4

3 & 4

2 & 3

80486DX2

Open

Open

Open

1 & 2, 3 & 4

3 & 4

2 & 3

SL80486DX2

2 & 3

1 & 2

3 & 4

1 & 2, 3 & 4

3 & 4

2 & 3

80486DX4

2 & 3

1 & 2

3 & 4

1 & 2, 3 & 4

3 & 4

2 & 3

Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Type

JP27

Any CPU installed

Open

CX486S2 only

Closed

Note: The location of JP27 is unidentified.

CPU SPEED CONFIGURATION

Speed

JP5

JP6

JP7

20MHz

Closed

Open

Closed

25MHz

Closed

Closed

Open

33MHz

Open

Closed

Closed

40MHz

Closed

Open

Open

50iMHz

Closed

Closed

Open

50MHz

Open

Open

Closed

66iMHz

Open

Closed

Closed

75iMHz

Closed

Closed

Open

100iMHz

Open

Closed

Closed

CPU SPEED CONFIGURATION (80486DX4 ONLY)

Speed

JP44

2x

pins 1 & 2 closed

2.5x

pins 2 & 3 closed

3x

Open

Note: The location of JP44 is unidentified.

CPU VOLTAGE CONFIGURATION

Voltage

JP80

3.45v

Open

5v

Closed

VL BUS WAIT STATE CONFIGURATION

Wait states

JP4

0 wait states

pins 1 & 2 closed

1 wait state

pins 2 & 3 closed

VL BUS SPEED CONFIGURATION

CPU speed

JP3

<= 33MHz

pins 1 & 2 closed

> 33MHz

pins 2 & 3 closed

MISCELLANEOUS TECHNICAL NOTE