Device Type

Mainboard

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

VIA VT

Video Chip Set

Cirrus Logic

Maximum Onboard Memory

64MB

Maximum Video Memory

2MB

Cache

64/128/256KB

BIOS

AMI, Award

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

CN3

IDE interface LED

J13

Serial port 1

CN4

Turbo LED

J20

Serial port 2

CN5

Turbo switch

J21

Parallel port

CN6

Reset switch

J22

VGA port

CN7

Speaker

J23

Floppy drive interface

CN8

Power LED & keylock

J24

IDE interface

CN9

32-bit VESA local bus slot

SL1

8514A connector

CN10

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

CMOS memory normal operation

J7

Open

CMOS memory clear (Award)

J7

Pins 1 & 2 closed

CMOS memory clear (AMI)

J7

Pins 2 & 3 closed

»

IOCHRDY disabled

J9

Open

IOCHRDY enabled

J9

Closed

»

Fast A20 enabled

J15

Pins 1 & 2 closed

KB A20 enabled

J15

Pins 2 & 3 closed

»

BALE enabled

J16

Open

BALe disabled

J16

Closed

»

Address decode select normal

JK3

Pins 1 & 2 closed

Address decode select Weitek interface

JK3

Pins 2 & 3 closed

»

On board video enabled

JV3

Closed

On board video disabled

JV3

Open

»

VGA IRQ9 disabled

JV4

Closed

VGA IRQ9 enabled

JV4

Open

SIMM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

None

None

None

2MB

(1) 512K x 36

None

None

None

2MB

(1) 256K x 36

(1) 256K x 36

None

None

3MB

(1) 512K x 36

(1) 256K x 36

None

None

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

None

4MB

(1) 1M x 36

None

None

None

4MB

(1) 512K x 36

(1) 256K x 36

(1) 256K x 36

None

4MB

(1) 512K x 36

(1) 512K x 36

None

None

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

5MB

(1) 1M x 36

(1) 256K x 36

None

None

5MB

(1) 512K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

6MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

None

6MB

(1) 1M x 36

(1) 512K x 36

None

None

SIMM CONFIGURATION (CON'T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

6MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

None

7MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

8MB

(1) 2M x 36

None

None

None

8MB

(1) 1M x 36

(1) 512K x 36

(1) 512K x 36

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

8MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

9MB

(1) 2M x 36

(1) 256K x 36

None

None

10MB

(1) 2M x 36

(1) 512K x 36

None

None

10MB

(1) 1M x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

10MB

(1) 512K x 36

(1) 2M x 36

None

None

11MB

(1) 2M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

12MB

(1) 2M x 36

(1) 512K x 36

(1) 512K x 36

None

12MB

(1) 2M x 36

(1) 1M x 36

None

None

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

None

14MB

(1) 2M x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

16MB

(1) 4M x 36

None

None

None

16MB

(1) 2M x 36

(1) 1M x 36

(1) 1M x 36

None

16MB

(1) 2M x 36

(1) 2M x 36

None

None

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

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

18MB

(1) 4M x 36

(1) 512K x 36

None

None

19MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

20MB

(1) 4M x 36

(1) 512K x 36

(1) 512K x 36

None

20MB

(1) 4M x 36

(1) 1M x 36

None

None

20MB

(1) 2M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

22MB

(1) 4M x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

24MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

None

24MB

(1) 4M x 36

(1) 2M x 36

None

None

24MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

None

28MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

32MB

(1) 8M x 36

None

None

None

32MB

(1) 4M x 36

(1) 2M x 36

(1) 2M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

32MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

40MB

(1) 4M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

52MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

56MB

(1) 2M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

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) 16K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JS1

JS2

64KB

Pins 1 & 2 closed

Pins 1 & 2 closed

128KB

Pins 2 & 3 closed

Pins 1 & 2 closed

256KB

Pins 2 & 3 closed

Pins 2 & 3 closed

VIDEO MEMORY CONFIGURATION

Size

Bank 0

Bank 1

1MB

(2) 256K x 16

None

2MB

(2) 256K x 16

(8) 44256

CPU SPEED SELECTION

Speed

J18/pins 1 & 2

J18/pins 3 & 4

J18/pins 5 & 6

J18/pins 7 & 8

12MHz

Closed

Closed

Closed

Open

16MHz

Open

Closed

Closed

Open

20MHz

Closed

Open

Closed

Open

24MHz

Closed

Closed

Closed

Closed

25MHz

Open

Open

Closed

Open

32MHz

Open

Closed

Closed

Closed

»

33MHz

Closed

Open

Open

Open

40MHz

Closed

Open

Closed

Closed

40MHz

Closed

Closed

Open

Open

50MHz

Open

Open

Closed

Closed

50MHz

Open

Closed

Open

Open

66MHz

Open

Closed

Open

Closed

66MHz

Closed

Open

Open

Closed

80MHz

Closed

Closed

Open

Closed

Test

Open

Open

Open

Closed

Power down

Open

Open

Open

Open

CPU TYPE SELECTION

Type

JC1

JC2

JC3

JC4

JK1

JK2

804860X-33

1 & 2

1 & 2

Closed

Closed

2 & 3

2 & 3

804868X-33

2 & 3

2 & 3

Open

Open

2 & 3

2 & 3

80486SX-20

2 & 3

2 & 3

Open

Open

1 & 2

1 & 2

80486SX-25

2 & 3

2 & 3

Open

Open

1 & 2

1 & 2

80487SX-20

1 & 2

1 & 2

Open

Open

1 & 2

1 & 2

80487SX-25

1 & 2

1 & 2

Open

Open

1 & 2

1 & 2

80486DX-20

1 & 2

1 & 2

Closed

Closed

1 & 2

1 & 2

80486DX-25

1 & 2

1 & 2

Closed

Closed

1 & 2

1 & 2

80486DX2-50

1 & 2

1 & 2

Closed

Closed

1 & 2

1 & 2

80486DX2-66

1 & 2

1 & 2

Closed

Closed

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE SELECTION

Type

JC5

»

PGA

Closed

PQFP

Open

VL BUS WAIT STATE SELECTION

Setting

JV5

»

0

Pins 2 & 3 closed

1

Pins 1 & 2 closed

VL BUS SPEED SELECTION

Speed

JV6

<= 33MHz

Pins 2 & 3 closed

>33 MHz

Pins 1 & 2 closed