SOYO COMPUTER CO., LTD.

SY-020M

   

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

SIS

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

245mm x 220mm

I/O Options

None

NPU Options

None

   

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J17

External battery

J20

Speaker

J18

Turbo switch

J21

Reset switch

J19

Turbo LED

J22

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select monochrome

JP3

Open

 

Monitor type select color

JP3

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

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

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

JP21

JP22

JP23

JP24

JP25

JP26

JP27

64KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

128KB

1 & 2

1 & 2

2 & 3

2 & 3

2 & 3

1 & 2

1 & 2

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

Oscillator OSC1

JP9

JP11

JP12

JP13

80486SX - 20MHz

40MHz

2 & 3

Open

2 & 3

2 & 3

80486SX - 25MHz

25MHz

1 & 2

Open

2 & 3

2 & 3

80487SX - 20MHz

40MHz

2 & 3

Closed

2 & 3

1 & 2

80486DX - 25MHz

33MHz

1 & 2

Closed

1 & 2

1 & 2

80486DX - 33MHz

33MHz

1 & 2

Closed

1 & 2

1 & 2

80486DX - 50MHz

50MHz

1 & 2

Closed

1 & 2

1 & 2

80486DX2 - 50MHz

25MHz

1 & 2

Closed

1 & 2

1 & 2

80486DX2 - 66MHz

33MHz

1 & 2

Closed

1 & 2

1 & 2

Note: Pins designated should be in the closed position.