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486SX/DX Board (VER. 2)

SOYO COMPUTER CO., LTD.

486SX/DX Board (VER. 2)

Processor

80486SX/80486DX

Processor Speed

20/25/33/50MHz

Chip Set

ETEQ

Max. Onboard DRAM

32MB

Cache

64/256KB

BIOS

AMI/Award

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

32-bit external memory card

CN1

External battery

J20

Power LED & keylock

J17

Turbo switch

J21

Speaker

J18

Turbo LED

J22

Reset switch

J19

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

JP2

Closed

Monitor type select monochrome

JP3

pins 2 & 3 closed

 

Monitor type select color

JP3

pins 1 & 2 closed

CMOS memory normal operation

JP5

pins 1 & 2 closed

 

CMOS memory clear

JP5

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

3MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

NONE

NONE

5MB

(4) 1M x 9

(4) 256K x 9

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

7MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

9MB

(4) 1M x 9

(4) 1M x 9

(4) 256K x 9

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

13MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 256K x 9

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

28MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

NONE

37MB

(4) 256K x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

NONE

49MB

(4) 256K x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

52MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

Note:Banks 2 and 3 are used when a 32-bit external memory card is installed at CN1.

CACHE CONFIGURATION

Size

Bank 0

64KB

(8) 8K x 8

256KB

(8) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP15

JP16

JP17

JP18

JP33

64KB

Open

Open

2 & 3

2 & 3

Open

256KB

Closed

Closed

1 & 2

1 & 2

Closed

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP103

JP104

JP106

80486SX

pins 1 & 2 closed

pins 1 & 2 closed

Open

80486DX

pins 2 & 3 closed

pins 2 & 3 closed

Closed

CPU SPEED CONFIGURATION

Speed

Oscillator at U18

Oscillator at U22

JP13

JP23

20MHz

40MHz

50MHz

pins 1 & 2 closed

pins 1 & 2 closed

25MHz

NONE

50MHz

pins 2 & 3 closed

pins 1 & 2 closed

33MHz

NONE

66MHz

pins 2 & 3 closed

pins 1 & 2 closed

50MHz

NONE

50MHz

pins 2 & 3 closed

pins 2 & 3 closed