Processor

80486SX/80487SX/80486DX/CX486DX2/80486DX2/80486DX4

Processor Speed

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

Chip Set

UMC

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

220mm x 220mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J3

Power LED & keylock

J8

Reset switch

J4

32-bit VESA Local bus slot

S1

Turbo switch

J5

32-bit VESA Local bus slot

S2

Turbo LED

J6

32-bit VESA Local bus slot

S3

Speaker

J7

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CMOS memory normal operation

JP1

Open

CMOS memory clear

JP1

Closed

»

Address strobe operation normal

JP7

pins 1 & 2 closed

Address strobe delay

JP7

pins 2 & 3 closed

»

Graphic controller Weitek Power 9000 not installed

JP19

pins 1 & 2 closed

Graphic controller Weitek Power 9000 installed

JP19

pins 2 & 3 closed

»

Factory configured - do not alter

JP20

Open

»

Double sided (double RAS) SIMM module installed

JP21 & JP22

pins 1 & 2 closed

16M x 36 (four RAS) SIMM module installed

JP21 & JP22

pins 2 & 3 closed

»

Factory configured - do not alter

JP24

Open

Note:16M x 36 can only be installed in bank 0.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

2MB

(1) 512K x 36

NONE

NONE

NONE

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 512K x 36

(1) 512K x 36

NONE

NONE

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 256K x 36

(1) 1M x 36

NONE

NONE

6MB

(1) 512K x 36

(1) 1M x 36

NONE

NONE

6MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

NONE

7MB

(1) 256K x 36

(1) 512K x 36

(1) 1M x 36

NONE

7MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

8MB

(1) 2M x 36

NONE

NONE

NONE

9MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

NONE

9MB

(1) 2M x 36

(1) 256K x 36

NONE

NONE

10MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

13MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 2M x 36

(1) 2M x 36

NONE

NONE

16MB

(1) 4M x 36

NONE

NONE

NONE

17MB

(1) 4M x 36

(1) 256K x 36

NONE

NONE

18MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

NONE

19MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

20MB

(1) 4M x 36

(1) 1M x 36

NONE

NONE

21MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

NONE

22MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

32MB

(1) 8M x 36

NONE

NONE

NONE

DRAM CONFIGURATION (CON'T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

33MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

NONE

33MB

(1) 8M x 36

(1) 256K x 36

NONE

NONE

34MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

34MB

(1) 8M x 36

(1) 512K x 36

NONE

NONE

36MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

NONE

36MB

(1) 8M x 36

(1) 1M x 36

NONE

NONE

40MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 8M x 36

(1) 8M x 36

NONE

NONE

64MB

(1) 16M x 36

NONE

NONE

NONE

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

CPU TYPE CONFIGURATION

Type

JP15

JP16

JP17

486SX

pins 2 & 3 closed

Open

Open

487SX

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

Open

486DX

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

Open

Cx486DX2

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

Closed

486DX2

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

Open

486DX4

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

Open

CPU SPEED CONFIGURATION

CPU clock

CPU frequency

JP8

JP9

JP10

25MHz

25, 50I, 75iMHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

33MHz

33, 66I, 100iMHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

40MHz

40MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

50MHz

50, 100iMHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

CPU VOLTAGE CONFIGURATION

Select

P1

P2

P3

5V (for all other CPUs

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

3.3V (for 80486DX4)

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

80486DX4 CONFIGURATION

CPU Clock

Multiplier

Frequency

JP18

25MHz

3

75iMHz

Open

33MHz

3

100iMHz

Open

50MHz

2

100iMHz

pins 2 & 3 closed

Note:If using a CPU other than a 80486DX4, the settings for JP18 are do not matter.

CACHE JUMPER CONFIGURATION

Size

JP2

JP3

JP4

JP5

JP6

64KB

pins 1 & 2

pins 1 & 2

Open

Open

Closed

128KB

pins 2 & 3

pins 2 & 3

Open

Closed

Closed

256KB

pins 1 & 2

pins 1 & 2

Closed

Closed

Closed

VESA CPU TYPE (ID0 & ID1) CONFIGURATION

CPU speed

JP13 (ID2)

JP14 (ID3)

< or = 33MHz

Closed

Open

> 33MHz

Open

Closed